Changes of Flag Leaf Photosynthetic Characteristics After Heading: Effect on Yield of Winter Wheat

doi:10.11924/j.issn.1000-6850.casb20200300173

Abstract

Abstract:

To explore the differences of photosynthetic characteristics among different wheat varieties and the relationship between photosynthesis and economic yield, four different winter wheat varieties were selected to determine their photosynthetic characteristics in six growth periods. Results showed that: the change tendency and degree of six photosynthetic characteristic indexes of wheat flag leaf with the development process were basically the same, but the values and change degrees of photosynthetic characteristics of different varieties in different development periods were different. Six photosynthetic characteristic indexes were positively correlated with grain yield respectively. The order of the correlation degree was as following: green leaf area > stomatal conductance > intercellular CO₂ concentration > net photosynthetic rate > chlorophyll content > transpiration rate. The order of correlation between photosynthetic characteristics and grain yield in different growth stages was middle grain filling stage > early grain filling stage >post grain filling stage >flowering stage> heading stage > end grain filling stage. It was the basis of increasing wheat yield to maintain and improve the green leaf area, chlorophyll content, net photosynthetic rate, stomatal conductance and intercellular CO₂ of flag leaf from flowering stage to post filling stage. Therefore, it is of reference value and guiding significance to determine and compare the photosynthetic characteristics of germplasm resources in wheat breeding with high light efficiency.

Key words: winter wheat varieties (lines), after heading, photosynthetic characteristics, yield

CLC Number:

S565.4

Li Longhua, Zhao Pengtao, Zhang Yaowen, Zhao Xiaoguang, Zhai Zhouping, Hou Junli, Shang Yi, Luo Honglian. Changes of Flag Leaf Photosynthetic Characteristics After Heading: Effect on Yield of Winter Wheat[J]. Chinese Agricultural Science Bulletin, 2020, 36(29): 22-31.

Figures/Tables 10

References 35

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	抽穗期	开花期	灌浆前期	灌浆中期	灌浆后期	灌浆末期	平均
净光合速率	0.416	0.612^*	0.898^**	0.712^*	0.326	0.022	0.50
气孔导度	0.363	0.669^*	0.647^*	0.817^**	0.217	0.114	0.47
蒸腾速率	0.269	0.531	0.669^*	0.567^*	0.312	0.08	0.40
胞间CO₂浓度	0.328	0.626^*	0.731^**	0.676^*	0.301	0.122	0.46
叶绿素含量	0.416	0.558	0.629^*	0.731^**	0.688^**	0.512	0.59
绿叶面积	0.526	0.612	0.879^*	0.965^**	0.828^**	0.368	0.70
平均	0.39	0.60	0.74	0.74	0.45	0.20

	抽穗期	开花期	灌浆前期	灌浆中期	灌浆后期	灌浆末期	平均
净光合速率	0.416	0.612^*	0.898^**	0.712^*	0.326	0.022	0.50
气孔导度	0.363	0.669^*	0.647^*	0.817^**	0.217	0.114	0.47
蒸腾速率	0.269	0.531	0.669^*	0.567^*	0.312	0.08	0.40
胞间CO₂浓度	0.328	0.626^*	0.731^**	0.676^*	0.301	0.122	0.46
叶绿素含量	0.416	0.558	0.629^*	0.731^**	0.688^**	0.512	0.59
绿叶面积	0.526	0.612	0.879^*	0.965^**	0.828^**	0.368	0.70
平均	0.39	0.60	0.74	0.74	0.45	0.20

	抽穗期	开花期	灌浆前期	灌浆中期	灌浆后期	灌浆末期	平均
净光合速率	0.349	0.422	0.518^*	0.592^*	0.316	0.022	0.37
气孔导度	0.303	0.369	0.695^*	0.627^*	0.347	0.114	0.41
蒸腾速率	0.169	0.231	0.269	0.467	0.412	0.09	0.27
胞间CO₂浓度	0.325	0.329	0.603^*	0.569^*	0.301	0.222	0.39
叶绿素含量	0.224	0.269	0.329	0.336	0.476^*	0.447^*	0.35
绿叶面积	0.326	0.412	0.679^*	0.665^*	0.778^*	0.578^*	0.57
平均	0.28	0.34	0.52	0.54	0.44	0.25

	抽穗期	开花期	灌浆前期	灌浆中期	灌浆后期	灌浆末期	平均
净光合速率	0.349	0.422	0.518^*	0.592^*	0.316	0.022	0.37
气孔导度	0.303	0.369	0.695^*	0.627^*	0.347	0.114	0.41
蒸腾速率	0.169	0.231	0.269	0.467	0.412	0.09	0.27
胞间CO₂浓度	0.325	0.329	0.603^*	0.569^*	0.301	0.222	0.39
叶绿素含量	0.224	0.269	0.329	0.336	0.476^*	0.447^*	0.35
绿叶面积	0.326	0.412	0.679^*	0.665^*	0.778^*	0.578^*	0.57
平均	0.28	0.34	0.52	0.54	0.44	0.25