Gomes, Mara de Menezes de Assis; Ramos, Maria José Mota; Torres Netto, Alena; Rosa, Raul Castro Carriello; Campostrini, Eliemar

doi:10.1590/0034-737X201865020004

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Plant Phisiology and Morphology • Rev. Ceres 65 (02) • Mar-Apr 2018 • https://doi.org/10.1590/0034-737X201865020004 copy

Water relations, photosynthetic capacity, and growth in passion fruit (Passiflora edulis Sims f. flavicarpa Deg.): seedlings and grafted plants¹ 1 This work is part of the practice of the subject Plant Ecophysiology (Post-Graduation Program in Plant Production / UENF).

Relações hídricas, metabolismo fotossintético e medidas biométricas em plantas de maracujazeiros (Passiflora edulis Sims f. flavicarpa Deg.): plantas seminais e plantas enxertadas

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Grafting has been used in passion fruit as a promising strategy for the improvement of traditional cultivars, which have roots susceptible to several soil pathogens. However, the effect of grafting on gas exchange, water relations, and photochemical efficiency in passion fruit is still not understood. The objective of this study was to evaluate the photosynthetic capacity, water relations, and the growth of seed-propagated (PPS) and grafted (PPG) passion fruit under drought stress. Ungrafted seedlings of Passiflora edulis f. flavicarpa and seedlings of Passiflora edulis f. flavicarpa (scion) grafted onto Passiflora mucronata (rootstock) were cultivated in a greenhouse in 3.5-dm³ pots. At 37 days after transplanting (DAT), one-half of the seed-propagated plants had the watering suspended (PPSDS, plant propagated by seed under drought stress) as well as one-half of the grafted plants (PPGDS, plant propagated by grafting under drought stress). Another group of plants was kept in soil at field capacity. Gas exchanges, chlorophyll fluorescence emission, chlorophyll content, and leaf and soil water potentials were determined during the experiment. Drought-stressed plants (PPSDS and PPGDS) reduced the stomatal conductance, incident quantum yield (Φi), and root dry mass in relation to the respective watered controls (PPS and PPG). Up to -50 kPa of soil water potential, both PPSDS and PPGDS reduced the photosynthetic rate by 50%, without reducing leaf water potential. The seed-propagated plants showed higher growth characteristics than the grafted plants in both conditions, at the field capacity and in the substrate with water limitation. Grafting showed no effect on water status, fluorescence emission, and gas exchange.

Keywords:
stomatal conductance; water stress; fluorescence; photosynthesis; leaf water potential; transpiration.

Treatment	Dry Mass (g)			Leaf Area
	Stem	Leaf	Root	(cm²)
PPS	6.9 a	10.0 a	10.3 a	1634.5 a
PPSDS	5.7 a	6.3 ab	7.1 b	1191.2 b
PPG	5.4 ab	6.3 ab	7.5 b	1237.6 b
PPGDS	4.7 b	4.7 b	5.3 c	944.2 b

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E-mail: ceres@ufv.br

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[1] * Corresponding author: mara.assis.gomes@gmail.com

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Water relations, photosynthetic capacity, and growth in passion fruit (Passiflora edulis Sims f. flavicarpa Deg.): seedlings and grafted plants1 1 This work is part of the practice of the subject Plant Ecophysiology (Post-Graduation Program in Plant Production / UENF).

Relações hídricas, metabolismo fotossintético e medidas biométricas em plantas de maracujazeiros (Passiflora edulis Sims f. flavicarpa Deg.): plantas seminais e plantas enxertadas

ABSTRACT

Water relations, photosynthetic capacity, and growth in passion fruit (Passiflora edulis Sims f. flavicarpa Deg.): seedlings and grafted plants¹ 1 This work is part of the practice of the subject Plant Ecophysiology (Post-Graduation Program in Plant Production / UENF).