山桐子果实发育过程中内含物、内源激素及光合特性的变化

doi:10.11707/j.1001-7488.20201105

Abstract

Abstract:

Objective: The objective of this study is to investigate and analyze the dynamic change patterns of photosynthetic characteristics, the contents and endogenous hormones in the process of fruit development of Idesia polycarpa, so as to provide reference for further study the mechanism of fruit development and regulation technology. Methods: In this paper, I. polycarpa derived from Chengdu was taken as the research material. The activities of superoxide dismutase (SOD) activity, peroxidase (POD) activity, catalase (CAT) activity, the content of MDA, soluble protein and soluble sugar were measured at different stages of fruit development. The contents of indole-3-acetic acid (IAA), abscisic acid (ABA), gibberellin acid (GA₃) and zeatin nucleoside (ZR) were determined by HPLC. The indexes of net photosynthetic rate (P_n), Transpiration rate (Tr), stomatal conductance (G_s) and intercellular CO₂ concentration (C_i) of plants were measured by LCpro-SD portable photosynthetic apparatus. Results: 1) SOD and POD activities showed overall a "down-rising" trend during the fruit development of I. polycarpa; CAT activity showed a "up-down" trend. MDA content showed an upward trend. The content of soluble sugar and soluble protein showed a "up-down" trend. 2) ABA content increased rapidly in period of fruit color change and ripening, and GA₃ content increased as a whole. The content of IAA was higher in fruit growth stage. The content of ZR was higher in both rapid growth and ripening stage of fruit. There were significantly positively correlations between ABA, GA₃ and ZR with soluble protein. 3) At different stages of fruit development, the diurnal change of P_n showed an asymmetric bimodal change trend, with an obvious phenomenon of "photosynthetic siesta", In addition, P_n was the highest at the slow growth stage. The trend of light response curve at different stages of fruit development was similar. The maximum net photosynthetic rate (P_nmax) was the highest, and dark respiration (R_d) and light saturation point (LCP) were the lowest at the slow fruit growth stage. LCP was positively correlated with ABA, GA₃ and ZR. The CO₂ response curve showed that there were higher P_nmax and CSP, and lower CO₂ compensation point (CCP) and photorespiration rate (R_p) at the slow growth stage. Conclusion: The dynamic changes of antioxidant enzyme, ABA, IAA, GA₃ and ZR contents in the fruit of I.polycarpa at different development stages are consistent with the fruit development rules, which would play an active regulatory role in the fruit development process. At the slow growth stage of I. polycarpa, there is a wide range of light energy and CO₂ utilization range as well as the relatively high net photosynthetic rate. However, at this time, high temperature and drought, stomatal conductance increases and transpiration rate reaches the highest. Therefore, timely irrigation should be carried out to maintain a high photosynthetic rate and provide ample photosynthetic products for I. polycarpa to ensure the excellent quality of the fruit.

Key words: Idesia polycarpa, fruit growth, inclusions, endogenous hormones, photosynthesis characteristics

CLC Number:

S718.43

Lisha Fang,Ziheng Xu,Zhen Liu,Zhi Li,Xiaodong Geng,Qifei Cai,Wenjing Zhai,Haiqing Zhou,Yanmei Wang. Changes of Contents, Endogenous Hormones and Photosynthetic Characteristics of Idesia polycarpa Fruit at the Different Developmental Stages[J]. Scientia Silvae Sinicae, 2020, 56(11): 41-52.

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References 0

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果实发育时期 The stages of fruit development	初始量子效率α	最大净光合速率 P_nmax /(μmol·m^-2s^-1)	光饱和点 LSP /(μmol·m^-2s^-1)	光补偿点 LCP /(μmol·m^-2s^-1)	暗呼吸速率 R_d
Ⅰ	0.05±0.001c	7.60±0.32b	1 334.14±86.61ab	13.35±6.35a	0.72±0.34ab
Ⅱ	0.04±0.005ab	10.11±0.32c	1 484.92±51.79b	9.44±0.25a	0.17±0.02a
Ⅲ	0.08±0.012c	5.58±0.60a	1 252.47±153.92ab	67.30±4.95b	3.68±0.33d
Ⅳ	0.025±0.007a	5.27±0.26a	1 079.29±6.71a	62.22±1.22b	1.33±0.31c

果实发育时期 The stages of fruit development	羧化速率CE	最大净光合速率 P_n_max /(μmol·m^-2s^-1)	CO₂饱和点 CSP /(μmol·m^-2s^-1)	CO₂补偿点 CCP /(μmol·m^-2s^-1)	光呼吸速率 R_p
Ⅰ	0.06±0.015a	32.77±1.62c	1663.60±160.23a	35.41±3.95a	2.02±0.27a
Ⅱ	0.06±0.006a	37.01±1.77c	1535.72±8.57a	30.90±2.21a	1.88±0.30a
Ⅲ	0.05±0.006a	18.47±1.86b	1404.90±117.90a	82.48±14.31b	3.69±0.17b
Ⅳ	0.13±0.030b	9.52±0.54a	1422.77±38.82a	155.51±40.20c	10.72±0.40c

指标 Index	ABA	GA₃	IAA	ZR	LSP	LCP	P_n	R_d	α	POD	SOD	CAT	MDA	可溶性糖 Soluble suger	可溶性蛋白 Soluble protein
ABA	1	0.93	-0.747	0.994^**	-0.871	0.981^*	-0.913	0.69	-0.103	0.266	-0.11	0.506	0.895	0.797	0.962^*
GA₃		1	-0.703	0.960^*	-0.803	0.975^*	-0.932	0.896	0.268	0.179	-0.213	0.423	0.955^*	0.871	0.956^*
IAA			1	-0.712	0.323	-0.798	0.462	0.675	-0.019	0.435	0.719	-0.942	-0.873	-0.93	-0.866
ZR				1	-0.888	0.987^*	-0.947	0.743	-0.011	0.292	-0.092	0.449	0.908	0.803	0.962^*
LSP					1	-0.805	0.958^*	-0.483	0.16	-0.7	-0.375	-0.023	-0.628	-0.447	-0.729
LCP						1	-0.903	0.816	0.08	0.141	-0.248	0.553	0.963^*	0.888	0.992^**
P_n							1	-0.713	-0.092	-0.522	-0.153	-0.144	-0.793	-0.641	-0.843
R_d								1	0.636	-0.149	-0.489	0.444	0.912	0.899	0.825
α									1	-0.313	-0.39	-0.087	0.27	0.32	0.089
POD										1	0.923	-0.648	-0.104	-0.317	0.021
SOD											1	-0.824	-0.479	-0.658	-0.36
CAT												1	0.662	0.776	0.649
MDA													1	1.976^*	0.980^*
可溶性糖 Soluble suger														1	0.931
可溶性蛋白 Soluble protein															1

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Changes of Contents, Endogenous Hormones and Photosynthetic Characteristics of Idesia polycarpa Fruit at the Different Developmental Stages

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