Effects of Water Deficit at Tasseling on Photosynthesis, Development, and Yield of Corn

Authors

  • Nawarat Udomprasert Department of Agronomy, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
  • Janjaree Kijjanon Monitoring and Evaluation Section, Rice Research Institute, Department of Agriculture, Bangkok 10900, Thailand.
  • Katharat Chusri-iam Department of Agronomy, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
  • Aneknan Machuay Department of Agronomy, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand

Keywords:

water deficit, photosynthesis, development, yield, corn

Abstract

This study was conducted to determine the effects of water deficits on net assimilation rates and development which were causes of grain yield reduction in maize. Two maize inbreds, Ki3 (purported drought sensitive) and Ki11 (purported drought tolerance), were pot-grown in greenhouse.
Plants were exposed to water deficit by withholding water until wilting occurred at tassel initiation and at anthesis. Water deficit at both stages reduced net assimilation rates (NAR) and relative growth rates (RGR) significantly in both maize inbreds. The reduction was more evident in Ki3 than that in Ki11. Water deficit at tassel initiation increased anthesis-to-silking interval (ASI) for 3 and 2 days in Ki3 and Ki11, respectively, while water deficit at anthesis increased ASI for only 1.25 and 0.75 days in Ki3 and Ki11, respectively. Considering yield and yield components, it was found that water deficits reduced ear girth, seed weight, grain yield, and harvest index in both inbreds. Water deficit at tassel initiation showed greater effects on those components than did the one at anthesis.

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Published

2005-12-31

How to Cite

Nawarat Udomprasert, Janjaree Kijjanon, Katharat Chusri-iam, and Aneknan Machuay. 2005. “Effects of Water Deficit at Tasseling on Photosynthesis, Development, and Yield of Corn”. Agriculture and Natural Resources 39 (4). Bangkok, Thailand:546-51. https://li01.tci-thaijo.org/index.php/anres/article/view/243396.

Issue

Section

Research Article