Effects of Different Water Gradients on Potato Growth and Photosynthetic Characteristics in Semi-arid Areas

doi:10.7668/hbnxb.20196035

Abstract

Abstract:

In order to reveal the response characteristics of potato growth,development,and photosynthetic traits to different water gradients during the critical growth period in semi-arid regions,this study conducted simulated experiments involving waterlogging (soil moisture maintained at 85% field capacity)and drought stress (drought initiated when soil moisture reached 65% field capacity)to investigate various growth traits and photosynthetic parameters of potatoes.The results showed that the plant height and biomass accumulation of potatoes under waterlogging were not different from those under normal irrigation.The plant height growth and biomass accumulation of potato under drought stress were significantly decreased.Meanwhile,the photosynthetic characteristics of potato leaves were significantly decreased under drought stress,including a 43% reduction in net photosynthetic rate and a 55% reduction in stomatal conductance.There was no significant difference in photosynthetic characteristics(except for stomatal conductance)between waterlogging treatment and normal irrigation treatment.Drought stress and waterlogging treatment decreased the photosynthetic capacity and light energy utilization of potato leaves to different degrees.Among them,under waterlogging conditions,the growth and development of potato leaves were more easily inhibited when exposed to strong light,and the activity of potato leaves was reduced.The growth and development of potato leaves were more easily inhibited when exposed to weak light under drought conditions,but the activity of potato leaves was not reduced.Comprehensive analysis showed that potato was more susceptible to drought stress in tuber expansion stage in semi-arid region,followed by longer waterlogging duration affecting potato growth and development.

Key words: Potato, Water stress, Photosynthetic characteristic, Semi-arid region, Waterlogging treatment

CLC Number:

YANG Yang, ZHAO Hong, ZHANG Kai, TANG Yurui, LU Wenhan. Effects of Different Water Gradients on Potato Growth and Photosynthetic Characteristics in Semi-arid Areas[J]. Acta Agriculturae Boreali-Sinica, 2026, 41(2): 111-118. doi: 10.7668/hbnxb.20196035.

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References 45

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处理 Treatment	Pn_max/ (μmol/(m²·s))	LSP/ (μmol/(m²·s))	LCP/ (μmol/(m²·s))	Rd/ (μmol/(m²·s))	AQY
CK	18.226 8	1 418.126	22.088 5	1.836 0	0.078
T1	15.808 7	1 211.363	22.037 8	1.510 4	0.059
T2	10.388 4	1 562.113	32.864 1	2.129 0	0.066

处理 Treatment	Pn_max/ (μmol/(m²·s))	LSP/ (μmol/(m²·s))	LCP/ (μmol/(m²·s))	Rd/ (μmol/(m²·s))	AQY
CK	18.226 8	1 418.126	22.088 5	1.836 0	0.078
T1	15.808 7	1 211.363	22.037 8	1.510 4	0.059
T2	10.388 4	1 562.113	32.864 1	2.129 0	0.066

处理 Treatment	Pn/ (μmol/(m²·s))	Gs/ (mol/(m²·s))	Ci/ (μmol/mol)	Tr/ (mmol/(m²·s))	WUE/ (μmol/mmol)	Ls
CK	18.114±1.418a	0.129±0.003b	111.407±2.101ab	2.879±0.355a	6.291±1.287a	0.646±0.063ab
T1	15.580±0.855a	0.190±0.011a	229.278±0.388a	3.854±0.400a	4.110±0.649a	0.394±0.002b
T2	10.386±0.112b	0.058±0.010c	93.369±10.945b	2.758±0.710a	3.822±0.805a	0.758±0.120a

处理 Treatment	Pn/ (μmol/(m²·s))	Gs/ (mol/(m²·s))	Ci/ (μmol/mol)	Tr/ (mmol/(m²·s))	WUE/ (μmol/mmol)	Ls
CK	18.114±1.418a	0.129±0.003b	111.407±2.101ab	2.879±0.355a	6.291±1.287a	0.646±0.063ab
T1	15.580±0.855a	0.190±0.011a	229.278±0.388a	3.854±0.400a	4.110±0.649a	0.394±0.002b
T2	10.386±0.112b	0.058±0.010c	93.369±10.945b	2.758±0.710a	3.822±0.805a	0.758±0.120a

指标 Index	主成分Principal component
指标 Index	Z₁	Z₂	Z₃
Pn_max	0.220 6	-0.124 4	0.545 0
LSP	0.107 5	-0.228 0	-0.508 7
LCP	-0.191 9	0.454 6	-0.127 6
Rd	-0.229 2	0.382 5	0.188 9
株高Plant height	0.361 7	-0.207 7	-0.187 6
SPAD	0.340 5	0.053 7	0.215 3
生物量Biomass	0.321 8	-0.223 5	-0.289 4
Gs	0.379 4	0.100 4	0.243 3
Ci	0.349 0	0.273 8	-0.074 1
Tr	0.300 0	0.357 5	0.031 8
WUE	-0.083 4	-0.427 6	0.363 3
Ls	-0.354 3	-0.264 3	0.062 1
AQY	-0.108 7	0.134 5	-0.159 2
特征值	5.78	3.64	2.06
Eigenvalue
贡献率/%	44.47	27.99	15.81
Contribution rate
累计贡献率/%	44.47	72.45	88.26
Cumulative contribution rate

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