The,relationships,between,maize(Zea,mays,L.)lodging,resistance,and,yield,formation,depend,on,dry,matter,allocation,to,ear,and,stem
Ping Zhng,Shungcheng Gu,Yunyun Wng,Chenchen Xu,Yting Zho,Xioli Liu,Pu Wng,*,Shouing Hung,*
a College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China
b College of Agronomy,South China Agricultural University,Guangzhou 510642,Guangdong,China
Keywords:Corn Lodging Yield formation Physical traits Dry matter allocation
ABSTRACT Lodging is a critical constraint to yield increase.There appear to be tradeoffs between yield formation and lodging resistance in maize.Hypothetically,it is feasible to reduce lodging risk as well as increase grain yield by optimizing dry-matter allocation to different organs under different environments.A three-year field experiment was conducted using four maize cultivars with differing lodging resistances and five growing environments in 2018–2020.Lodging-susceptible(LS)cultivars on average yielded more than lodging-resistant(LR)cultivars when lodging was not present.The yield components kernel number per ear(KN)and thousand-kernel weight(TKW)were both negatively correlated with lodging resistance traits(stalk bending strength,rind penetration strength,and dry matter weight per internode length).Before silking,the LR cultivar Lishou 1(LS1)transported more assimilates to the basal stem,resulting in a thicker basal stem,which reduced dry matter allocation to the ear and in turn KN.The lower KN of LS1 was also due partly to the lower plant height(PH),which increased lodging resistance but limited plant dry matter production.In contrast,the LS cultivars Xianyu 335(XY335)and Xundan 20(XD20)produced and allocated more photoassimilates to ears,but limited dry matter allocation to stems.After silking,LS cultivars showed higher TKW than LR cultivars as a function of hig...
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