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Increasing photosynthetic performance and post-silking n uptake by moderate decreasing leaf source of maize under high planting density

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Journal of Integrative Agriculture 2021年第2期20卷 494-510页

作者： CAO Yu-jun WAnG Li-chun GU Wan-rong WAnG Yong-jun ZHAnG Jun-hua College of Agriculture Northeast Agricultural UniversityHarbin 150030P.R.China Institute of Agricultural Resources and Environment Jilin Academy of Agricultural Sciences/State Engineering Laboratory of MaizeNational Development and Reform CommissionChangchun 130033P.R.China

To date,little attention has been paid to the effects of leaf source reduction on photosynthetic matter production,root function and post-silking n uptake characteristics at different planting *** a 2-year field experiment,Xianyu 335,a widely released hybrid in China,was planted at 60 000 plants ha^(–1 )(conventional planting density,CD) and 90 000 plants ha^(–1) (high planting density,HD),*** all the filaments protruded from the ear,at which point the plants were subjected to the removal of 1/2 (T1),1/3 (T2) and 1/4 (T3) each leaf length per plant,no leaf removal served as the control(CK).We evaluated the leaf source reduction on canopy photosynthetic matter production and n accumulation of different planting *** CD,decreasing leaf source markedly decreased photosynthetic rate (P_(n)),effective quantum yield of photosystem II (ΦPSII) and the maximal efficiency of photosystem II photochemistry (F_(v)/F_(m)) at grain filling stage,reduced post-silking dry matter accumulation,harvest index (HI),and the *** with the CK,the 2-year average yields of T1,T2 and T3 treatments decreased by 35.4,23.8 and 8.3%,***,decreasing leaf source reduced the root bleeding sap intensity,the content of soluble sugar in the bleeding sap,post-silking n uptake,and n accumulation in *** grain n accumulation in T1,T2 and T3 decreased by 26.7,16.5 and 12.8% compared with CK,*** HD,compared to other treatments,excising T3 markedly improved the leaf P_(n),ΦPSII and F_(v)/F_(m) at late-grain filling stage,increased the post-silking dry matter accumulation,HI and the grain *** yield of T3 was 9.2,35.7 and 20.1% higher than that of CK,T1 and T2 on average,*** T3 treatment also increased the root bleeding sap intensity,the content of soluble sugar in the bleeding sap and post-silking n uptake and n accumulation in *** with CK,T1 and T2 treatments,the grain n accumulation in T3 increase

关键词： different planting densities leaf source reduction canopy photosynthetic matter production post-silking n uptake grain n accumulation

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