<i>Torulaspora globosa</i>: rhizosphere yeast promoting lettuce growth on seedlings and under field conditions

Cabrini, Paloma G; Sala, Fernando C; Magri, Márcia M Rosa

doi:10.1590/S0102-053620190303

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Research • Hortic. Bras. 37 (3) • Jul-Sep 2019 • https://doi.org/10.1590/S0102-053620190303 copy

Torulaspora globosa: rhizosphere yeast promoting lettuce growth on seedlings and under field conditions

Torulaspora globosa: levedura rizosférica promotora de crescimento de alface para produção de mudas e em campo

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Among soil microorganisms, one group stands out as beneficial to agricultural activities: a plant growth-promoting rhizobacteria (PGPM). These microorganisms support plants through phytohormone production, nutrient provision and plant health maintenance. Among these PGPM, yeasts have a high potential, which is still not very well known.This study aimed to evaluate the effect of inoculation with the rhizosphere yeast Torulaspora globosa (strain 5S55) on development of lettuce (cv. Crocantela). The first research consisted of inoculating seeds with yeast (100 cells/seed), and inoculating seeds, 7 and/or 15 days after emergence (DAE) (1x10⁶ cells/plant). The second one consisted of transplanting seedlings from the first experiment to field. Inoculation of seeds and seedlings provided a significant increase of seedling root dry mass; we observed the significant increase of 27% in productivity of lettuce under field conditions, of shoot fresh mass and a raise of number of leaves per plant. However, studies on inoculation methods, inoculum formulation, cell concentration are essential to optimize the results in growth promotion and to establish technology.

Keywords:
Lactuca sativa; plant growth promotion; biostimulant; cv. Crocantela

Inoculation	CPA	CR	LF	CF	MSPA	MSR	NL
Inoculation	(cm)				(g)		NL
seed (-), 7 DAE (-), 15 DAE (-)	3.56¹	8.42 ab²	1.99 b	3.46 b	0.035 b	0.025 b	3.47 ab
seed (-), 7 DAE (+), 15 DAE (-)	3.61	8.66 ab	2.06 b	3.41 b	0.033 b	0.026 b	3.53 ab
seed (-), 7 DAE (-), 15 DAE (+)	3.53	8.39 ab	2.20 ab	3.28 b	0.034 b	0.028 b	3.37 ab
seed (-), 7 DAE (+), 15 DAE (+)	3.53	8.62 ab	2.08 b	3.41 b	0.033 b	0.025 b	3.53 ab
seed (+), 7 DAE (-), 15 DAE (-)	3.77	8.27 ab	2.14 ab	3.65 ab	0.036 b	0.026 b	3.47 ab
seed (+), 7 DAE (+), 15 DAE (+)	3.70	8.69 ab	2.15 ab	3.70 ab	0.037ab	0.029 ab	3.73 a
seed (+), 7 DAE (-), 15 DAE (+)	3.64	9.13 a	2.13 ab	3.47 b	0.034 b	0.026 b	3.20 b
seed (+), 7 DAE (-), 15 DAE (+)	3.81	7.71 b	2.40 a	4.08 a	0.042 a	0.033 a	3.17 b
CV (%)	9.27	7.35	8.47	10.31	11.67	12.01	7.67

Inoculation	CPA	CF	CC	MFPA	MSR	NL
Inoculation	(cm)			(g)		NL
seed (-),7 DAE (-),15 DAE (-)	22.00 c²	25.63 b	2.75¹	334.50 b	14.11¹	14.50 b
seed (-), 7 DAE (+), 15 DAE (-)	24.17 ab	28.46 a	3.50	407.33 ab	16.42	16.33 a
seed (-), 7 DAE (-),15 DAE (+)	22.50 abc	26.00 ab	3.00	360.67 ab	14.08	16.67 a
seed (-), 7 DAE (+), 15 DAE (+)	22.08 bc	26.21 ab	2,96	359.42 ab	17.57	15.33 ab
seed (+), 7 DAE (-), 15 DAE (-)	24.62 a	27.08 ab	3.08	402.17 ab	18.25	16.25 a
seed (+), 7 DAE (+), 15 DAE (+)	23.29 abc	27.00 ab	3.17	382.83 ab	16.83	16.00 ab
seed (+), 7 DAE (-), 15 DAE (+)	23.42 abc	27.50 ab	3.29	425.33 a	18.56	16.42 a
seed (+), 7 DAE (-), 15 DAE (+)	23.25 abc	27.54 ab	2.96	383.17 ab	16.44	15.92 ab
CV (%)	5.89	6.23	14.04	13.31	22.10	6.42

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[TFN1] ¹parameter without statistical difference; ²same letters among data in the column do not differ significantly among each other, Fisher test (5%); DAE= days after emergence; CPA= shoot length; CR= root length; LF= leaf width; CF= leaf length; MSPA= shoot dry mass; MSR= root dry mass; NL= number of leaves.