Many studies have been conducted on maize to study the effect of drought on yield at the flowering stage, but understanding biochemical and photosynthetic response against drought at the seedling stage needs to be well established. Thus, to understand differential changes and interaction of biochemical and photosynthetic parameters at the seedling stage under drought, a greenhouse experiment with twelve maize genotypes under severe drought (30% field capacity) and irrigated (90-100% field capacity) conditions were performed. Drought differentially altered biochemical and photosynthetic parameters in all genotypes. A sharp increase in hydrogen peroxide, malondialdehyde (MDA), and total antioxidant capacity (TAOC) were seen and a positive association between H2O2 and TAOC, and MDA and transpiration rate (E) was observed under drought. Nonphotochemical quenching increased under drought to avoid the photosystem damage. PCA biplot analysis showed that reducing E and increasing photosynthetic efficiency would be a better drought adaptation mechanism in maize at the seedling stage.

CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences 650201 Kunming Yunnan China

Centre for Mountain Futures Kunming Institute of Botany 650201 Kunming Yunnan China

College of Agriculture and Ecological Engineering Hexi University Zhangye 734000 Gansu China

Department of Genetics and Plant Breeding Banaras Hindu University 221005 Varanasi India

East and Central Asia Regional Office World Agroforestry 650201 Kunming Yunnan China

MARA CABI Joint Laboratory for Biosafety Institute of Plant Protection Chinese Academy of Agricultural Sciences 100193 Beijing China

Zobrazit více v PubMed

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