Photosynthetic performance of contrasting <i>Jatropha curcas</i> genotypes during the flowering and fruiting stages

Domiciano, Gisele Pereira; Kobayashi, Adilson Kenji; Molinari, Hugo Bruno Correa; Laviola, Bruno Galveas; Alves, Alexandre Alonso

doi:10.1590/S0100-204X2018000100002

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PLANT PHYSIOLOGY • Pesq. agropec. bras. 53 (01) • Jan 2018 • https://doi.org/10.1590/S0100-204X2018000100002 copy

Photosynthetic performance of contrasting Jatropha curcas genotypes during the flowering and fruiting stages

Desempenho fotossintético de genótipos contrastantes de pinhão-manso durante estádios de florescimento e frutificação

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract:

The objective of this work was to evaluate physiological processes in contrasting physic nut (Jatropha curcas) genotypes during the flowering and fruiting stages. Gas exchange parameters were measured using an infrared gas analyzer, and morphological traits were evaluated during each stage under natural conditions, in a randomized complete block design with five replicates. Differences in yield between J. curcas accessions were not related to photosynthetic performance, but rather to the number of inflorescences and female flowers, which are genetically determined. Moreover, the net CO₂ assimilation was equivalent in both genotypes, although they produced different amount of fruit. The genotypes differed consistently in terms of carboxylation efficiency and ribulose bisphosphate regeneration. Finally, J. curcas branch growth is not impaired by the increased sink strength during fruiting, and fruit may have been actually exerting a positive effect on the net CO₂ assimilation, which may have enabled plants to maintain growth while producing flowers and fruits.

Index terms:
Jatropha curcas; biodiesel; carboxylation efficiency; gas exchange; photosynthetic capacity

Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira Caixa Postal 040315, 70770-901 Brasília DF Brazil, Tel. +55 61 3448-1813, Fax +55 61 3340-5483 - Brasília - DF - Brazil
E-mail: pab@embrapa.br

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[TFN1] ⁽¹⁾LT, leaf temperature; and RT, for room temperature (25ºC).

A/C_i parameter	Accession/temperature⁽¹⁾				Unit
	CNPAE-102		CNPAE-169
	LT	RT	LT	RT
V _cmax	194	194	285	285	μmol m^-2 s^-1
J	218	218	380	380	μmol m^-2 s^-1
TPU	14.7	14.7	26.8	26.9	μmol m^-2 s^-1
R _d	12.07	12.06	36.61	36.59	μmol m^-2 s^-1
g _m	0.98	0.98	1.40	1.40	μmol m^-2 s^-1 Pa^-1

Parameter⁽²⁾	Gas exchange parameter
Parameter⁽²⁾	A	gs	E	C_i/C_a	A/g_s	A/E	VPD
A	1	0.1482^ns	0.5334**	-0.1381^ns	0.0141^ns	-0.2570*	-0.1861^ns
g _s	0.6102**	1	0.4349**	0.0928^ns	-0.4030**	-0.2709**	-0.3025^ns
E	0.5616**	0.6826**	1	0.1074^ns	-0.3165*	-0.1993^ns	0.0075^ns
C_i/C_a	-0.0486^ns	0.2067^ns	0.299^ns	1	-0.8560**	0.8393**	0.7393**
A/g_s	-0.1187^ns	-0.5933**	-0.33976**	-0.8297**	1	-0.6470**	-0.6213**
A/E	-0.2628*	-0.0289^ns	-0.0630^ns	0.8999**	-0.7353**	1	0.939**
VPD	-0.3306**	-0.1733^ns	0.0585^ns	0.6823**	-0.5491**	0.8616**	1

Morpho-agronomic trait⁽¹⁾	Gas exchange parameter⁽²⁾
Morpho-agronomic trait⁽¹⁾	A	gs	E	C_i/C_a	A/g_s	A/E	VPD
	CNPAE-102
Height	-0.1598^ns	-0.0314^ns	-0.3984**	0.0961^ns	0.0126^ns	0.1414^ns	-0.0234^ns
NIP	0.3064*	0.0812^ns	0.0688^ns	-0.0532^ns	0.0098^ns	-0.2176^ns	-0.2752*
NMF	0.3361**	0.0223^ns	0.1035^ns	-0.0716^ns	0.0574^ns	-0.2082^ns	-0.2404^ns
NFF	0.2770*	0.0573^ns	0.0445^ns	-0.0661^ns	0.06353^ns	-0.2174^ns	-0.2697*
BG	-0.0846^ns	0.0248^ns	-0.3199*	-0.0487^ns	-0.0237^ns	0.0475^ns	-0.0463^ns
NGF	-0.5030**	-0.1952^ns	-0.6092**	-0.3945**	0.4802**	-0.1171^ns	-0.2091^ns
	CNPAE-169
Height	0.0074^ns	0.1176^ns	0.2517*	-0.0414^ns	-0.0520^ns	-0.0595^ns	0.0141^ns
NIP	-0.1063^ns	-0.3223*	-0.2128^ns	-0.2590*	0.4077**	-0.1898^ns	-0.0870^ns
NFM	-0.1824^ns	-0.2983*	-0.2144^ns	-0.2219^ns	0.3257*	-0.1569^ns	-0.0859^ns
NFF	-0.1140^ns	-0.2942*	-0.2148^ns	-0.2279^ns	0.3423**	-0.1491^ns	-0.0815^ns
BG	-0.0613^ns	0.0088^ns	-0.0810^ns	-0.0444^ns	0.0255^ns	-0.0715^ns	-0.0124^ns
NGF	-0.3396**	-0.2891*	-0.5544**	-0.2456^ns	0.2561*	-0.1223^ns	-0.2664*