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 หัวเรื่อง:อิทธิพลของระยะเวลาในการขาดน้ำต่อปริมาณโพรลีนและคุณภาพของหญ้ากินนี ผู้เขียน: ดร.นวรัตน์ อุดมประเสริฐ, รองศาสตราจารย์ ,  Suwapong Sawasdiphanich สื่อสิ่งพิมพ์:pdf AbstractThe effects of the duration of water stress on forage quality of purple guinea (Panicum maximum Jacq.) were determined by using the accumulation of praline content during water stress as and indicator for drought tolerance. The plants were subjected to water stress for 10, 15 and 20 days before praline, protein, and acid-detergent fiber analyses. It was found that protein content of guinea grass decreased under the short period of water stress condition, but increased then the stress was prolonged. Protein content was similar to the control when plants were subjected to water for 20 days. Acid-detergent fiber increased under water stress condition. However, different durations of water stress had no effect on the quantity of acid-detergent fiber. Proline content increased as the duration of water stress increased. The results suggested that purple guinea tends to acclimate to drought as considering from the change in its proline and protein contents. |
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หัวเรื่อง:ความสัมพันธ์ของการสะสมโพรลีนเนื่องจากสภาวะขาดน้ำและผลผลิตของข้าวโพด ผู้เขียน:ดร.นวรัตน์ อุดมประเสริฐ, รองศาสตราจารย์, นายราเชนทร์ ถิรพร, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractCorn is one of the important economic crops in Thailand that has faced great environmental limitation such as drought. Without physiological parameters, corn selection for drought tolerance would be impeded. The objectives of this study were to determine proline content accumlated due to water stress treatments and its relationship to corn yield and whether proline content could be used as parameter for corn drought tolerance selection. The inbred line Ki3 and the F1 hybrid DK888 were subjected to water stress at different stages of development, i.e. vegetative, tasseling, silking and grain filling stages. Proline content was determined during water stress treatments and after recovery by using spectrophotometric technique. It was found that water stress had the greatest effect on proline content and yield when treated at tasseling stage in both varieties. Proline content and corn yield were negatively correlated in both varieties. This consistency suggested that proline content might be used as parameter for corn drought tolerance selection. |
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. |
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