 หัวเรื่อง:อิทธิพลของสภาวะขาดน้ำในระยะเวลาออกช่อดอกตัวผู้ต่อระดับของโพรลีนและกรดแอ็บซิสิค และผลผลิตของข้าวโพด ผู้เขียน: ดร.นวรัตน์ อุดมประเสริฐ, รองศาสตราจารย์ ,  Janjaree Kijjanon, นายราเชนทร์ ถิรพร, ศาสตราจารย์ , Aneknan Machuay สื่อสิ่งพิมพ์:pdf AbstractWater stress affects a number of physiological processes which consequently affect crop yield. The objective of this study was to determine the effects of water stress on levels of proline and ABA and yield of 2 corn varieties; Ki3, a purported drought-sensitive variety, and Ki11, a purported drought-tolerant one. Plants were exposed to water stress at tassel initiation and at anthesis until wilting appeared and then rewatered until recovered. Leaf samples were collected at wilting and at recovery for proline and ABA analyses using spectrophotometric technique and gas chromatography, respectively, compared to control plants. It was found that water stress at both tassel initiation and anthesis caused an increase in proline and ABA levels in both corn varieties. The increase was greater in Ki3 than in Ki11. When plants were rewatered, both proline and ABA levels decreased to the control level. Water stress at both stages decreased number of seeds per ear and seed weight in both corn varieties which consequently decreased grain yield per plant but the effect was more evident in Ki3 than in Ki11. Water stress at tassel initiation showed greater influence on proline and ABA levels and yield than that at anthesis. Moreover, it was found that proline and ABA levels accumulated under water stress conditions were negatively correlated with corn yield. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Water Deficit at Tasseling on Photosynthesis, Development, and Yield of Corn) ผู้เขียน:ดร.นวรัตน์ อุดมประเสริฐ, รองศาสตราจารย์, Janjaree Kijjanon, Katharat Chusri-iam, Aneknan Machuay สื่อสิ่งพิมพ์:pdf AbstractThis 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. |