| ชื่อบทความ |
Genotypic performance under intermittent and terminal drought screening in rainfed lowland rice (ไม่ผ่านการอนุมัติ 1405224475) |
| วัน/เดือน/ปี ที่ได้ตอบรับ |
29 ตุลาคม 2556 |
| วารสาร |
| ชื่อวารสาร |
Field Crops Research |
| มาตรฐานของวารสาร |
|
| หน่วยงานเจ้าของวารสาร |
Elsevier |
| ISBN/ISSN |
|
| ปีที่ |
156 |
| ฉบับที่ |
1 |
| เดือน |
|
| ปี พ.ศ. ที่พิมพ์ |
2557 |
| หน้า |
281-292 |
| บทคัดย่อ |
severity of water stress is highly variable from year to year and the current drought screening method for
rainfed lowland rice utilizes a late planting to impose a prolonged terminal drought in the wet season.
In this paper, an alternative drought screening method was investigated for areas where photoperiod
insensitive genotypes are commonly grown with the aim of identifying promising genotypes exposed
to short-duration intermittent drought, a condition that is more frequently experienced in the rainfed
lowlands in the wet season. To assess the usefulness of intermittent drought screening the performance
of genotypes was compared with that tested under traditional flooded and terminal drought treatments
in wet and dry seasons for two years.
Mean yield reduction in intermittent and terminal drought was 13 and 35% respectively in the wet
season and 34 and 59% respectively in the dry season, indicating that the proposed intermittent drought
screening in the dry season and the current terminal drought screening in wet season would provide the
magnitude of drought severity that would be appropriate for screening. Genotypes shown to be drought
tolerant, based on their drought response index (DRI), were consistent in intermittent and terminal
drought screening. There was no significant relationship between potential grain yield obtained under
well watered treatments and DRI, indicating that some drought tolerant genotypes can achieve high yield,
thus adaptation to a wide range of rainfed lowland conditions is expected. Due to genotypic variation in
flowering in relation to rainfall or irrigation events in the terminal and intermittent drought treatments
respectively, delay in flowering was not consistent across experiments and thus, is not expected to be a
useful trait for selection particularly when using intermittent screening methods. It is therefore concluded
that intermittent drought with appropriate level of drought stress could be used with DRI as a criterion
for selection of well adapted genotypes suitable for the rainfed lowlands. |
| คำสำคัญ |
Water deficit Potential yield Drought tolerance Delay in flowering, Drought response index, Aerobic conditions |
| ผู้เขียน |
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| การประเมินบทความ |
มีผู้ประเมินอิสระ |
| สถานภาพการเผยแพร่ |
ตีพิมพ์แล้ว |
| วารสารมีการเผยแพร่ในระดับ |
นานาชาติ |
| citation |
มี |
| เป็นส่วนหนึ่งของวิทยานิพนธ์ |
เป็น |
| แนบไฟล์ |
|
| Citation |
0
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