Trocas gasosas em palmeira gariroba cultivada sob condições subtropicais

hb Horticultura Brasileira Hortic. Bras. 0102-0536 1806-9991 Associação Brasileira de Horticultura RESUMO Nativa do Brasil, a garirobeira produz palmito amargo, consumido como hortaliça em saladas, bem como em outras receitas da culinária brasileira. Este trabalho foi realizado em condição de campo para avaliar as variações diurnas das trocas gasosas de garirobeiras, considerando sua inter-relação com alguns elementos climáticos. Foram realizadas avaliações em garirobeiras cultivadas no espaçamento 2x1 m, conduzidas sob irrigação, durante dois anos consecutivos. Foram avaliadas a assimilação líquida de CO2 (PN), condutância estomática (gs ), transpiração (E), temperatura foliar (Tf) dentro da câmara e densidade de fluxo de fótons fotossinteticamente ativos (DFFF). A eficiência do uso da água (EUA) foi estimada pela razão: EUA = PN/E. A assimilação líquida de CO2 (PN), mostrou um platô em maio, observado entre 9 e 14 h, atingindo média de 5,4 μmol m-2s-1, em seguida declinando no fim da tarde. Em agosto, PN aumentou a partir do início da manhã até as 11h, quando atingiu o máximo de 9,0 µmol m-2s-1. A partir de então, decresceu, atingindo 6,0 µmol m-2s-1 às 14 h. Mesmo sob temperaturas mais baixas de outono e inverno as garirobeiras cultivadas apresentaram trocas gasosas compatíveis com os elementos do clima. Heart-of-palm, a product from the upper part of the stem of some palms was already consumed by several native people in Brazil as well as other countries of South and Central America, since ancient times. The abundance of this vegetal material as well as its acceptation by consumers made heart-of-palm to be considered a gourmet vegetable, allowing establishment of rentable market based on exploitation of this product (Modolo et al., 2013). Many palm species of the Brazilian flora are appreciated and the most important market is represented by those of sweet type such as juçara palm (Euterpe edulis), açaí (Euterpe oleracea) and peach palm (Bactris gasipaes) (Modolo et al., 2012). Gariroba palm (Syagrus oleracea), also known as guariroba, gueroba, gueiroba, guerova, differs from other heart-of-palm producing palms by the characteristic flavor of its heart-of-palm, presenting high content of phenols that gives a bitter and astringent taste, highly appreciated in the culinary of many regions. This characteristic results probably from the high tannin content (almost three times higher than the juçara palm) as well as some amino acids such as phenylalanine, tyrosine and proline (Shimokomaki et al., 1975). Besides the bitter taste, heart-of-palm presents a harder consistency once its major part is of caulinar type. The edible portion weighs from 0.5 to 3.0 kg in average. Gariroba palm is native to semi-deciduous forests as well as to the Brazilian “cerrado” occurring naturally in a wide range, including Bahia, Minas Gerais, São Paulo, Mato Grosso, Mato Grosso do Sul, Goiás and Tocantins (Lorenzi et al., 2010). Due to its geographic origin, this species is acclimated to high sun radiation and low rain precipitation from 800 to 1200 mm/year, withstanding soil water deficits throughout the winter months. Nevertheless, for commercial gariroba palm production, planting density is high, that is 10.000 to 22.000 plants ha-1 (Modolo, 2014) and thus restriction factors to plant growth (fertilization and water deficit) should be observed. The lack of a cultivar makes plant growth and consequently harvesting uneven, even under proper cultivation conditions (plants are maintained on the same area for 3 to 4 years). The knowledge of gariroba palm gas exchange under subtropical conditions will contribute to comprehension of its photosynthetic pattern under irrigation. Palms show maximum values of CO2 assimilation (PN) under 20 µmol m-2s-1 (Jayasekara & Jayasekara, 1995). On the other hand, Larcher (2000), suggested for C3 trees, maximum PN between 10 and 15 µmol m-2s-1. Differently to what has been observed for palms of more economical importance like coconut (Gomes & Prado, 2007; Gomes et al., 2008; Passos et al., 2009), oil palm (Dufrêne & Saugier, 1993; Suresh et al., 2012) and lately the heart-of-palm producer palms (Tucci et al., 2007, 2010; Lavinsky et al., 2014; Pereira et al., 2014), no references to gariroba palms gas exchange were found. Nevertheless, regarding other species of genus Syagrus, a study was carried out on the species S. coronata, under greenhouse conditions and water deficit imposed by water withdraw, and a tolerance of photosynthetic apparatus to drought was observed (Medeiros et al., 2015). In dry season of the Brazilian northeast semi-arid, S. coronata, presented low sensibility to low water availability and high water use efficiency (Oliveira et al., 2016). Regarding anatomic characteristics of leaves, the species of genus Syagrus present a thick cuticle that can be considered a protection against desiccation, once these species thrive in regions prone to soil water deficits (Leite & Scatena, 2001; Oliveira et al., 2016). It is known that gas exchange variation both diurnal and seasonal are influenced by climate elements characteristic of the region, mainly light, air temperature and air relative humidity, besides soil water availability (Koslowski & Pallardi, 1997). This research was carried out to evaluate diurnal and seasonal variation of gas exchange of gariroba palms cultivated under subtropical conditions, considering their interrelation with some climate elements. MATERIAL AND METHODS The experiment was carried out at Campinas Experimental Center, Instituto Agronômico (IAC), in Campinas, São Paulo State, Brazil (22º54’S; 47º05’O, 674 m altitude). According to Köppen classification, the climate is Cwa with a warm and rainy season from October to March, medium air temperature from 22 to 24ºC and 1057 mm precipitation; a dry season from April to September, with medium air temperature varying from 18 to 22ºC, 325 mm precipitation, according to Ortolani et al. (1995). Young gariroba palm plants raised from seeds of open pollinated matrices were transplanted to field conditions, spaced 2x1 m. Soil analysis at the beginning of the experiment presented the following chemical characteristics: pH (CaCl2)= 6.0; organic matter (g dm-3)= 29.0; C.T.C. (mmolc dm-3)= 100.4; V%= 78%; P (mg dm-3)= 40.0; K (mmolc dm-3)= 2.9; Ca (mmolc dm-3) = 53.0; Mg (mmolc dm-3)= 22.0; Fe (mg dm-3)= 14.0; Mn (mg dm-3)= 5.9; Cu (mg dm-3)= 4.1; Zn (mg dm-3)= 1.2; B (mg dm-3)= 0.25; H+Al (mmolc dm-3)= 22.0; S.B. (mmolc dm-3)= 77.9. Two months before transplantation the area was plowed and, according to soil analysis and recommendation (Bovi & Bortoletto, 1998), 500 kg ha-1 of dolomitic limestone were incorporated. After, grooves were opened for the young plants transplantation. No chemical fertilization was applied at planting. According to soil analysis 120 g of N, 12 g of K2O and 6 g of P2O5 were applied per plant, four doses per year, starting seven month after planting. Plants were irrigated through microaspersion, one emissor for each 2 plants and defined according to culture evapotranspiration (ETC), estimated using the reference evapotranspiration (ETo) by Penman-Monteith method (Allen et al., 1998), calculated based on meteorological data of the local climate station. According to Delgado-Rojas et al. (2012), the transpiration of an irrigated area of peach palm represents 92% of the ETo on average; therefore considering decrease of the irrigation efficiency due to direct evapotranspiration, the crop coefficient (Kc) for peach palm is considered to be 1, that is ETc = ETo. On the other hand, despite the fact that gariroba palm does not emit off-shoots like peach palm, it has same growth characteristic and approximately same foliar area. Therefore the use of same parameter of ETc estimative was chosen to irrigate the experimental area. In the first year, six month-old gariroba palms still presenting biphid leaves were evaluated. Gas exchange evaluations were carried out under field conditions, in May 2012. In August 2013, gariroba palms of the same area now 21 month-old, presenting pinnate leaves, were evaluated. Experiment was arranged in a completely random design and data were subjected to analyses of variance considering both evaluation months (May and August) and time of day (five times) as source of variation. Net CO2 assimilation (PN), stomatal conductance (gs ), transpiration (E), leaf temperature (Tl ) inside chamber and photosynthetic photon flux density (PPFD) were evaluated. Evaluations were performed with a portable infrared gas analyzer (LCA-4, ADC BioScientific Ltd., Great Amwell, U.K.). Water use efficiency (WUE) was estimated by the ratio WUE = PN/E. Measurements were performed on the medium portion of the youngest completely expanded leaf (leaf +1), according to Tomlinson criteria (Tomlinson, 1990) and throughout the experiment, leaves of the same ontogenetic state were evaluated, for both dry and wet seasons in sunny days from 8 to 17 h. Air temperatures and relative humidity (RH) were monitored by a meteorological station at 300 m from the experimental area. Average diurnal data were calculated from 3 to 6 replications. When significance was observed mean values were submitted to Student-Newman-Keuls multiple range test (p≤0.05). Graphs were performed according to Origin 6.0 (OriginLab Corp., Northampton, USA) program. RESULTS AND DISCUSSION Under subtropical conditions it is important to consider that once plants had been irrigated, other climate elements other than the soil water status can have imposed some effect on gas exchange. Concerning air temperature in May, minimum (14ºC) and maximum (23ºC) values were observed at 7 and at 15 h, respectively. Whereas RH was minimum from 15 to 16 h, reaching 28%, leaf temperature varied from 19 to 34ºC, at 8 and 14 h respectively (Figure 1A and 1B). In August 2013 air temperatures were higher, with minimum (15ºC) and maximum (29ºC) values observed at 7 and 15 h, respectively with leaf temperature varying from 26 to 35ºC, from 8:30 to 13:30 h, respectively, whereas RH was minimum at 15 h reaching 32% (Figure 1C and 1D). Measurements in May 2012 were performed under autumn conditions, with milder air temperatures than the occurring on following year (August 2013), end of winter, with plants prepared to another growth cycle. Figure 1 Diurnal courses of average air temperature (Tair) and relative air humidity (RH) (A, C), provided by a meteorological station, andleaf temperature (Tl) and photosynthetic photon flux density (PPFD) (B, D), registered inside the gas analyzer chamber on May, 2012 (●) andon August, 2013 (○). Note that the scales on the x-axes of the right frames are different from those on the left. Campinas, IAC, 2012/2013. Regarding gas exchange, variance analyses of both evaluations showed significant difference (p≤0.05) among days and hours for the following variables PN, gs , E, Tl and PPFD. On the other hand for WUE, differences were observed (p≤0.05) only among hours. PN, gs , E, Tl were higher at second year. Average values of PN, including all measurement times were 4.0 and 6.5 µmol m-2 s-1 for the first and second years, respectively. Concerning gs , medium values were 0.172 mol m-2 s-1 at first year and higher at second year reaching 0.238 mol m-2 s-1. E corresponded to 1.59 and 2.66 mmol m-2 s-1 at first and second years, respectively, whereas average value of Tl presented the same tendency, lower at first year (27.6ºC) and higher at second (30.6ºC). Like it was observed for peach palm (Tucci et al., 2010), although other climate elements were favorable, PN was lower because of the lower temperature at the night previous to measurements. It is known that climate elements mainly PPFD, temperature and air RH influence directly gas exchange of all plant species and its impact is of high importance to physiology of production, once productivity depends highly on the PN throughout the crop cycle (Taiz & Zeiger, 2009). Like all palms (Tucci et al., 2010; Prado et al. 2001; Passos et al., 2009), gariroba palm presented diurnal variation of gas exchange with a performance consistent with that of photosynthetic metabolism of C3 plants (Larcher, 2000), both in May and in August (Figure 2 and 3). Figure 2 Diurnal courses of net CO2 assimilation - PN (A), transpiration - E (B), stomatal conductance - gs (C) and water use efciency -WUE (D), in gariroba palms, on May, 2012 (●) and on August, 2013 (օ). Each symbol represents the mean value (± standard error) of threeto six replications. Campinas, IAC, 2013. Daily courses of PN, gs, E, WUE, showed variations according to climate conditions observed throughout evaluations in May (Figure 2) and August (Figure 2). In May, 2012, PN increased in early morning (Figure 2A) following the increase of PPFD (Figure 1B), remaining constant until 14 h. The maximum medium value of PN observed at the plateau from 9 to 14 h was 5.4 μmol m-2 s-1. A depression was not noted neither on the PN curve nor on the E curve at 14 h, although g value was lower. Values of g remained around 0.23 mol m-2 s-1 from 8 to 11 h, declining with decrease of RH in afternoon, although E remained constant, around 2.0 mmol m-2s-1 until 14 h. From 14 to 16 h PN decreased probably due to decrease of g and to the low RH that reached 28%, despite the fact that PPFD was over 1000 µmol m-2 s-1, what for a C3 plant like gariroba palm is over the photosynthesis saturation by PPFD (Larcher 2000). WUE (Figure 2D) remained high from early morning to 16 h. PN decrease at 16 h followed the low PPFD of late afternoon (Figure 1B). Regarding the daily courses observed in August (Figure 2), PN increased from early morning to 11 h, when it reached the maximum value of 9.0 µmol m-2s-1. From then on PN decreased 33% until 14 h (p≤0.05), reaching 6.0 µmol m-2s-1 at 14 h still under PPFD over 1200 µmol m-2s-1. From 14 to 16 h PN values remained constant, dropping with PPFD decrease (Figure 1D). Diurnal variation of g s followed the same PN pattern, presenting maximum value of 0.412 mol m-2s-1, under maximum PN (Figure 2C). On the other hand, E was maximum reaching 4.4 mmol m-2s-1 around noon, when Tl reached the maximum value of 35oC. From this point on, g and PN decreased (Figure 1 and 3). After 12 h, higher values of air temperature and Tl were observed, concomitantly to lower values of RH (Figure 1C), what may have contributed for the decrease of WUE from 12 to 16 h, when it reached values under 2.0 µmol CO2 /mmol H20. From then on it recovered the status of the early morning, over 3 µmol CO2/mmol H20 (Figure 2D). It is important to remember that gariroba palms were under irrigation throughout the experiment and therefore variations of gs and PN have not been due to soil water deficit, but to atmospheric conditions of the evaluation days. Results can be considered consistent with the environmental conditions observed when measurements were performed. Maximum PN value of 9.0 µmol m-2s-1 in August can be compared to that of 10 µmol m-2 s-1 observed for S. coronata under field conditions of the Pernanbuco State semi-arid region in the rainy season (Oliveira et al., 2016). In irrigated peach palms under subtropical conditions of São Paulo State, Brazil, PN maximum reached 15 µmol m-2s-1 in February (Tucci et al., 2010). In other palms of economic importance, like dwarf coconut, PN reached values of 14-17 µmol m-2s-1 (Gomes & Prado, 2007; Gomes et al. 2008; Passos et al. 2009). Therefore, it can be considered that maximum values of PN of 5.4 and 9.0 µmol m-2s-1 observed for gariroba palms in May and August respectively, could not represent the maximum limit for PN of the species. In other seasons, under favorable conditions, such as hot and humid summers, gariroba palm may present maximum values of PN higher than the mentioned in present study. Therefore it is important to consider that gas exchange measurements were performed in May and August when air temperatures at night and pre-dawn reached minimum values of 14-15ºC (Figure 1A and 1C). This fact could have contributed to the decline of gariroba palm PN mainly in May, when air temperature remained under 15ºC during 7 hours (Figure 1A). It is worth observing that evaluations were performed in May and August, autumn and winter, respectively. As a matter of fact, according to what has been related for peach palm (Tucci et al., 2010), low night temperatures lowered the photosynthetic response. The same effect was observed in other species like mango (Allen et al., 2000) and citrus (Ribeiro et al., 2009a,2009b), what was considered by Allen et al. (2000), as a consequence of a stomatal limitation of PN due to an increase of sensitivity of guard cells to intercellular CO2. In August, but not in May (Figure 2), variation of diurnal course of gas exchange followed the model described by Koslowski & Pallardi (1997) for tropical plants, that is, PN increased sharply at the beginning of morning, paralleling PPFD, reaching the maximum value at mid morning. 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