喷施生长调节剂缓解甘薯干旱胁迫的机理

doi:10.3864/j.issn.0578-1752.2020.03.004

Abstract

Abstract:

【Objective】The study was conducted to investigate the effects of spraying growth regulators on the distribution of photosynthetic products in sweet potato and the alleviation effects on drought stress.【Method】Artificial dry shed and dry pond were used to simulate the drought stress of potato swell (100-120 d), and based on ¹³C labeling method, the alleviation effects of spraying three exogenous hormones such as 6-benzylaminopurine (6-BA), α-naphthyl acetic acid (NAA) and abscisic acid (ABA) on drought stress of sweet potato were studied. The physiological and biochemical indexes, such as the accumulation and distribution rate of ¹³C, endogenous hormone content, carbon metabolism enzyme activity and photosynthetic fluorescence characteristics of sweet potato leaves, were analyzed. And then we performed stepwise regression analysis, path analysis and RDA analysis.【Result】Compared with normal water supply, drought stress decreased the yield of sweet potato by 18.76% (P＜0.05). The degree of the decrease of yield was greatly smaller with the spraying of growth regulator under drought stress (P＜0.05). The best effect of spraying was 6-BA which was followed by ABA and NAA. Spraying growth regulators under drought stress could significantly improve the photosynthetic efficiency of functional leaves, which could promote the synthesis of photosynthetic products during the expansion of potato tubers. Compared with the spraying of water, the spraying of 6-BA promoted the net photosynthetic rate (Pn), which increased by 10.93% and the maximum photochemical efficiency (Fv/Fm) which increased by 20.00%. Spraying different growth regulators in drought could significantly increase the instantaneous accumulation of ¹³C and the rate of distribution to the roots of sweet potato. Different growth regulators could promote the transfer of photosynthetic products ( ¹³C) from leaves to roots and distribution which increased by 75.68% and 27.68% by spraying 6-BA, respectively. In addition, spraying growth regulators increased leaf carbon metabolizing enzyme activity. Compared with the spraying of water, the spraying of 6-BA, NAA and ABA increased SS enzyme activity increased by 29.59%, 19.25% and 13.03%, respectively. Spraying growth regulators alleviated the decrease of ZR and IAA content caused by drought. Compared with the spraying of water, the spraying of 6-BA increased ZR and IAA by 18.72% and 10.97%, respectively. Stepwise regression analysis showed that photosynthetic characteristics, chlorophyll fluorescence characteristics, carbon metabolism enzyme activity and endogenous hormones were key indicators for regulating the distribution of photosynthetic products ( ¹³C) at the peak of potato tube expansion (R=0.997); Path analysis showed that Pn, SPS, ABA, ZR, SS and Fv/Fm had the higher direct interaction coefficient on the transfer and distribution of the product ( ¹³C) from the leaves to the roots for sweet potato photosynthesis; RDA analysis showed that the spraying of 6-BA had a good correlation with the total ¹³C accumulation of sweet potato, the distribution of ¹³C in roots, ZR, Pn, Fv/Fm, SS and SPS.【Conclusion】Spraying growth regulators under drought stress raised endogenous hormone content, carbon metabolism enzyme activity based on SPS and ADPGase, improved leaf photosynthetic characteristics, and promoted the transport of photosynthetic products ( ¹³C) from leaf to root in potato tube expansion stage, besides which could relieve the effects of drought stress.

Key words: sweet potato, drought stress, plant growth regulators, ¹³C distribution

WANG JinQiang,LI SiPing,LIU Qing,LI Huan. Mechanism of Spraying Growth Regulators to Alleviate Drought Stress of Sweet Potato[J].Scientia Agricultura Sinica, 2020, 53(3): 500-512.

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处理 Treatment	产量 Yield (t·hm^-2 FW)	单株结薯数 Root number	平均薯重 Root weight (g)
CK	33.80±1.21a	3.17±0.05a	213.47±2.49a
LD	27.46±0.45d	2.33±0.04e	205.36±1.40e
LD+ABA	30.44±0.88bc	2.67±0.05c	211.31±0.89c
LD+NAA	29.71±0.50c	2.50±0.03d	208.73±1.04d
LD+6-BA	32.10±1.06ab	2.83±0.04b	212.47±1.59b

时期 Stage	处理 Treatment	总积累量 Total accumulation (µg/plant)	叶 Leaf (µg/plant)	分配率 Distribution rate (%)	茎 Stem (µg/plant)	分配率 Distribution rate (%)	块根 Root tuber (µg/plant)	分配率 Distribution rate (%)	须根 Fibrous root (µg/plant)	分配率 Distribution rate (%)
膨大期 Expansion stage	CK	16.67±0.23a	6.32±0.07a	37.91±0.65c	2.48±0.07a	14.89±0.27c	7.28±0.12a	43.68±0.40a	0.59±0.07a	3.51±0.36d
膨大期 Expansion stage	LD	6.53±0.15e	3.05±0.09e	46.73±1.15a	1.42±0.07c	21.73±0.57a	1.72±0.04e	26.33±0.67d	0.34±0.03d	5.21±0.43a
	LD+ABA	10.82±0.17c	3.85±0.14d	35.57±1.06d	1.91±0.12b	17.64±1.02b	4.73±0.08c	43.67±0.12a	0.34±0.05d	3.11±0.48e
	LD+NAA	10.42±0.17d	4.48±0.13c	42.96±0.85b	1.87±0.06b	17.91±0.34b	3.66±0.09d	35.12±0.96c	0.42±0.03c	4.01±0.29b
	LD+6-BA	13.60±0.15b	5.36±0.06b	39.44±0.38c	1.96±0.10b	14.41±0.59c	5.76±0.07b	42.35±0.55b	0.52±0.04b	3.80±0.29c
收获期 Harvest stage	CK	15.37±0.27a	4.09±0.08a	26.59±0.03b	1.94±0.08a	12.62±0.30b	9.12±0.07a	59.35±0.78b	0.22±0.04c	1.44±0.24b
收获期 Harvest stage	LD	6.09±0.04e	1.98±0.02d	32.53±0.58a	1.04±0.03d	17.00±0.22a	2.95±0.08e	48.44±0.77c	0.12±0.01d	2.02±0.16b
	LD+ABA	9.93±0.04c	2.24±0.01c	23.76±0.30d	1.20±0.04c	12.25±0.40b	6.08±0.06c	61.85±0.36a	0.34±0.05b	3.49±0.29a
	LD+NAA	9.67±0.20d	2.40±0.09c	25.09±1.08c	1.17±0.06c	12.23±0.67b	5.62±0.03d	58.73±0.05b	0.38±0.07ab	3.96±0.65a
	LD+6-BA	12.51±0.07b	3.38±0.06b	27.04±0.55b	1.36±0.07b	10.90±0.42c	7.33±0.04b	58.62±0.25b	0.43±0.01a	3.33±0.03a

处理 Treatment	净光合速率 Pn (mol·m^-2·s^-1)	蒸腾速率 Tr (mmol·m^-2·s^-1)	气孔导度 Gs (mmol·m^-2·s^-1)	细胞间隙CO₂浓度 Ci (mol·mol^-1)
CK	20.60±0.70a	5.11±0.04a	390.50±20.60a	280.57±11.70a
LD	18.58±1.46b	3.16±0.91c	212.67±11.30c	240.00±6.32c
LD+ABA	19.34±0.68b	3.09±0.06d	201.33±11.98d	253.86±5.25b
LD+NAA	18.78±0.96b	3.21±0.26c	214.94±15.11c	243.64±7.71bc
LD+6-BA	20.61±0.40a	3.51±0.04b	235.95±10.98b	277.23±8.42a

处理 Treatment	Fv/Fm	PI abs	ABS/CSm	ETo/CSm	TRo/ABS
CK	0.69±0.02a	2.32±0.16b	28784±1878a	9916±211ab	0.69±0.04a
LD	0.55±0.04d	1.23±0.08d	20875±594c	5744±756d	0.56±0.05b
LD+ABA	0.64±0.02b	2.03±0.06c	25412±1474b	8955±207b	0.70±0.04a
LD+NAA	0.60±0.03c	1.94±0.08c	28684±488a	7854±688c	0.65±0.03a
LD+6-BA	0.66±0.01b	2.90±0.16a	28312±910a	10750±717a	0.70±0.01a

处理 Treatment	SS (mg Suc·g^-1 FW·h^-1)	SPS (mg Suc·g^-1 FW·h^-1)	ADPGase (µmol NADPH·g^-1 FW·h^-1)
CK	24.28±0.34a	22.31±0.34a	5.98±0.34a
LD	17.80±0.31e	17.09±0.04e	4.02±0.04e
LD+ABA	21.22±0.35c	20.24±0.36c	5.19±0.36c
LD+NAA	20.12±0.49d	18.61±0.38d	4.65±0.38d
LD+6-BA	23.06±0.20b	21.04±0.19b	5.36±0.19b

Mechanism of Spraying Growth Regulators to Alleviate Drought Stress of Sweet Potato

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处理 Treatment	ZR (ng·g^-1 FW)	IAA (ng·g^-1FW)	ABA (ng·g^-1 FW)
CK	35.68±0.87a	114.50±8.13a	191.43±1.34e
LD	25.69±1.00d	75.75±1.18d	247.36±2.30b
LD+ABA	29.06±0.17c	81.83±1.96c	270.31±1.29a
LD+NAA	28.02±0.34c	88.13±3.56b	221.49±6.48c
LD+6-BA	30.50±0.69b	84.06±1.81c	215.77±3.46d

作用因子 Action factor	直接效应 Direct action	间接效应 Indirect effect
作用因子 Action factor	直接效应 Direct action	→Pn	→Gs	→Fv/Fm	→PI abs	→ABS/CSm	→SS	→SPS	→ADPGase	→ZR	→ABA
Pn	1.5730		0.1240	0.0031	-0.8223	0.0959	0.0603	0.0381	-0.6058	1.0433	-0.6749
Gs	0.3297	0.0279		0.0012	0.0177	0.0736	0.0556	0.0357	-0.1108	0.0516	0.3714
Fv/Fm	0.8119	0.0123	0.0328		-0.0138	-0.0319	-0.0042	-0.0064	0.0235	0.0086	-0.0834
PI abs	0.0303	0.0349	0.1922	0.0054		0.0677	0.0454	0.0272	-0.0782	0.0391	0.3159
ABS/CSm	0.1727	-0.0263	0.1404	-0.0022	-0.0119		0.0573	0.0328	-0.1000	0.0289	0.5702
SS	1.0762	0.0374	0.2405	-1.3207	0.1181	0.1299		0.0470	-0.1960	0.0473	0.5867
SPS	1.3484	-0.6372	0.2429	-1.9016	-0.2170	0.4171	0.0741		-0.1417	1.0473	0.5540
ADPGase	0.1439	0.0348	0.2540	-0.0019	0.0165	-0.1200	0.0742	0.0477		-0.0478	0.5519
ZR	1.1557	0.0368	0.3054	0.9018	-0.9130	-0.0894	0.0648	0.0411	-1.1234		0.4757
ABA	1.1986	-0.0352	-0.1917	0.0015	1.0150	-0.9542	-0.0700	-0.0920	0.1243	-0.0415

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