不同水分胁迫下的春小麦叶片气体交换参数和水分利用效率研究

doi:10.13866/j.azr.2021.03.24

Abstract

Abstract:

Leaf gas exchange parameters are the physiological basis of crop yield. Among these parameters, the photosynthetic and transpiration rates play a decisive role in leaf water use efficiency. Therefore, they are essential to research on crop drought resistance and water conservation. Potted water simulation experiments were conducted in spring wheat at Dingxi and Wuwei stations. Four group of treatments, including the control (CK), continuous drought stress (WS), moderate drought stress (40%FC), and severe drought stress (30%FC) treatments, were established to analyze the response characteristics and related characteristics of the gas exchange parameters and water use efficiency (WUE_inst) of spring wheat leaves under different levels of water stress. Under continuous drought stress, the daily soil water consumption, photosynthetic rate, transpiration rate, and stomatal conductance of spring wheat all showed an initially rapid and then slow downward trend. When the stress reached moderate and severe drought, these parameters were decreased by 71% and 76%, 39% and 60%, 57% and 66%, and 60% and 77%, respectively. The extent of reduction was stomatal conductance>transpiration rate>photosynthetic rate. The intercellular CO₂ concentration decreased during mild to moderate drought, and it was decreased by 33% under late moderate drought stress. Subsequently, an increasing trend was observed. WUE_inst showed an upward trend during the stage from mild to moderate drought. It was increased by 41% at the late moderate drought stage, and then it decreased rapidly. Compared with CK, WUE_inst increased during mild to severe drought, and it reduced after extreme drought. However, when water stress was maintained at the level of moderate or severe drought, the above indicators were similar at the same drought level under continuous drought. Additionally, the values of moderate drought were all higher than those of severe drought (P<0.05). The photosynthesis and transpiration rates were the dominant factors for each other under the mild to moderate stage of continuous drought stress, and stomatal conductance was their common dominant factor under this stress after the late moderate drought and when water stress was maintained at moderate or severe drought. WUE_inst was dominantly influenced by the transpiration rate under well-watered and continuous drought stress, and it was not significantly regulated by leaf gas exchange parameters when water stress was maintained at moderate or severe drought. The research results provide a reference for informing the use of appropriate measures in different drought stages and situations.

Key words: spring wheat, water stress, photosynthetic parameters, stomatal conductance, water use efficiency

CHEN Fei,YAN Shuang,WANG Heling,ZHANG Kai,ZHAO Funian,HUANG Xiaoyan. Study on gas exchange parameters and water use efficiency of spring wheat leaves under different levels of water stress[J].Arid Zone Research, 2021, 38(3): 821-832.

Figures/Tables 8

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处理	参数	显著性	LSD
处理	参数	显著性	2015DX	2017DX	2017WW
CK	SW	0.000	a	b	c
	P_n	0.284	a	a	a
	T_r	0.246	a	a	a
	g_s	0.016	a	b	b
	C_i	0.001	a	b	c
	WUE_inst	0.306	a	a	a
WS	SW	0.117	a	ab	b
	P_n	0.885	a	a	a
	T_r	0.812	a	a	a
	g_s	0.611	a	a	a
	C_i	0.922	a	a	a
	WUE_inst	0.808	a	a	a

处理	SW	P_n	T_r	g_s	C_i	WUE_inst
40%FC	6.34±0.97a	17.31±1.92a	4.03±0.72a	0.22±0.08a	221.60±28.55a	4.50±0.33a
30%FC	3.94±1.15b	8.42±2.55b	2.19±0.86b	0.08±0.09b	182.53±23.75b	3.80±0.49b

处理	参数	因子	相关系数	直接通径系数	间接通径系数
处理	参数	因子	相关系数	直接通径系数	P_n/(μmol·m^-2·s^-1)	g_s/(mol·m^-2·s^-1)	C_i/(μmol·mol^-1)	T_r/(mmol·m^-2·s^-1)	合计
CK	P_n	g_s	0.445^*	1.511	-	-	-1.034	-0.031	-1.065
		C_i	0.073	-1.220	-	1.281	-	0.012	1.293
		T_r	0.088	-0.208	-	0.225	0.071	-	0.296
	T_r	P_n	0.088	-0.377	-	0.543	-0.078	-	0.465
		g_s	0.149	1.22	-0.168	-	-0.903	-	-1.071
		C_i	-0.058	-1.065	-0.028	1.034	-	-	1.006
	WUE_inst	P_n	0.347	0.478	-	-0.069	0.015	-0.077	-0.131
		g_s	0.102	-0.155	0.213	-	0.175	-0.131	0.257
		C_i	0.161	0.207	0.035	-0.131	-	0.051	-0.045
		T_r	-0.872^**	-0.879	0.042	-0.023	-0.012	-	0.007

处理	参数	因子	相关系数	直接通径系数	间接通径系数
处理	参数	因子	相关系数	直接通径系数	P_n/(μmol·m^-2·s^-1)	g_s/(mol·m^-2·s^-1)	C_i/(μmol·mol^-1)	T_r/(mmol·m^-2·s^-1)	合计
WS	P_n	g_s	0.919^**	0.07	-	-	-0.006	0.855	0.849
		C_i	-0.268	-0.166	-	0.003	-	-0.105	-0.102
		T_r	0.981^**	0.895	-	0.067	0.019	-	0.086
	T_r	P_n	0.981^**	0.88	-	0.131	-0.03	-	0.101
		g_s	0.956^**	0.143	0.809	-	0.004	-	0.813
		C_i	-0.117	0.113	-0.236	0.005	-	-	-0.231
	WUE_inst	P_n	0.516^**	0.662	-	0.54	0.23	-0.916	-0.146
		g_s	0.271	0.587	0.609	-	-0.033	-0.892	-0.316
		C_i	-0.903^**	-0.857	-0.177	0.022	-	0.109	-0.046
		T_r	0.378^*	-0.933	0.65	0.561	0.1	-	1.311
WSF	P_n	g_s	0.936^**	0.0133	-	-	0.089	0.834	0.923
		C_i	0.936^**	0.0942	-	0.013	-	0.829	0.842
		T_r	0.99^**	0.8898	-	0.012	0.088	-	0.100
	T_r	P_n	0.99^**	0.9137	-	0.081	-0.004	-	0.077
		g_s	0.937^**	0.0862	0.855	-	-0.004	-	0.851
		C_i	0.932^**	-0.0047	0.855	0.081	-	-	0.936
	WUE_inst	P_n	-0.877^**	1.2495	-	1.094	-1.034	-2.187	-2.127
		g_s	-0.775^**	1.1691	1.17	-	-1.044	-2.07	-1.944
		C_i	-0.889^**	-1.1044	1.17	1.105	-	-2.059	0.216
		T_r	-0.906^**	-2.2092	1.237	1.095	-1.029	-	1.303
WSL	P_n	g_s	0.956^**	0.6272	-	-	0.147	0.182	0.329
		C_i	-0.73^*	-0.2675	-	-0.344	-	-0.118	-0.462
		T_r	0.973^**	0.1849	-	0.617	0.171	-	0.788
	T_r	P_n	0.973^**	0.1273	-	0.77	0.076	-	0.846
		g_s	0.984^**	0.8052	0.122	-	0.057	-	0.179
		C_i	-0.639^*	-0.104	-0.093	-0.442	-	-	-0.535
	WUE_inst	P_n	0.831^**	-0.2119	-	-0.24	0.501	0.782	1.043
		g_s	0.714^*	-0.2513	-0.203	-	0.376	0.791	0.964
		C_i	-0.907^**	-0.6857	0.155	0.138	-	-0.514	-0.221
		T_r	0.789^**	0.8042	-0.206	-0.247	0.438	-	-0.015

处理	参数	因子	相关系数	直接通径系数	间接通径系数
处理	参数	因子	相关系数	直接通径系数	P_n /(μmol·m^-2·s^-1)	g_s /(mol·m^-2·s^-1)	C_i /(μmol·mol^-1)	T_r /(mmol·m^-2·s^-1)	合计
40%FC	P_n	g_s	0.986^**	1.1517	-	-	-0.18	0.014	-0.166
		C_i	0.806^*	-0.2067	-	1.003	-	0.01	1.013
		T_r	0.825^*	0.018	-	0.917	-0.11	-	0.807
	T_r	P_n	0.825^*	0.285	-	1.032	-0.492	-	0.540
		g_s	0.796^*	1.0464	0.281	-	-0.531	-	-0.250
		C_i	0.531	-0.6102	0.23	0.911	-	-	1.141
	WUE_inst	P_n	-0.248	1.7255	-	-3.29	1.573	-0.256	-1.973
		g_s	-0.183	-3.3372	1.701	-	1.7	-0.247	3.154
		C_i	0.271	1.9519	1.391	-2.907	-	-0.165	-1.681
		T_r	-0.507	-0.3105	1.424	-2.656	1.036	-	-0.196
30% FC	P_n	g_s	0.982^**	1.1631	-	-	-0.214	0.033	-0.181
		C_i	0.608	-0.2865	-	0.87	-	0.024	0.894
		T_r	0.95^**	0.0345	-	1.119	-0.203	-	0.916
	T_r	P_n	0.95^**	-3.8146	-	5.444	-0.679	-	4.765
		g_s	0.962^**	5.5438	-3.746	-	-0.836	-	-4.582
		C_i	0.71	-1.1175	-2.319	4.147	-	-	1.828
	WUE_inst	P_n	-0.263	-0.3759	-	3.472	-0.436	-2.923	0.113
		g_s	-0.33	3.5362	-0.369	-	-0.537	-2.96	-3.866
		C_i	-0.486	-0.7178	-0.229	2.645	-	-2.185	0.231
		T_r	-0.542	-3.0771	-0.357	3.402	-0.51	-	2.535

Study on gas exchange parameters and water use efficiency of spring wheat leaves under different levels of water stress

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