Abstract
Stay-green in the post-anthesis period is thought to be an efficient drought-tolerance trait in crops, but its effectiveness in rice (Oryza sativa L.) is unknown. Our objectives were to determine whether the stay-green trait exists in rice cultivars in drought-prone areas. Twenty-four cultivars from Japan and Vietnam were grown in pots of 0.08 m in diameter and 1.00 m deep. At heading, irrigation was terminated in half of the pots and continued in the remaining pots. Every four days during the grain-filling period, we measured the leaf green color with a chlorophyll meter (SPAD), the green leaf area (GLA) and the fraction of transpirable soil water (FTSW). The capacity for maintenance of SPAD-value and GLA in desiccated soils was evaluated by determining the ratio of integrated SPAD-value and GLA in desiccated (D) plants to those in irrigated (I) plants (SPADD/I or GLAD/I, respectively). The SPADD/I and GLAD/I in 24 cultivars showed diverse frequency distributions. Cultivars belonging to higher ranges of the distribution in SPADD/I and GLAD/I tended to show higher ratios of plant dry weight at harvest in D to in I plants. SPADD/I and GLAD/I in the grain-filling period were poorly correlated with those in the seedling period in desiccated soils, and hence the capacity for maintenance of green leaves in the grain-filling period would differ from that in the seedling period. These results suggest that the stay-green trait exists as the capacity for maintaining green leaves and benefits dry matter production in desiccated soils in rice cultivars in drought-prone areas.
| Original language | English |
|---|---|
| Pages (from-to) | 397-408 |
| Number of pages | 12 |
| Journal | Plant Production Science |
| Volume | 12 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Nov 9 2009 |
| Externally published | Yes |
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Keywords
- Drought
- Grain-filling period
- Rice
- Seedling period
- Stay-green
ASJC Scopus subject areas
- Agronomy and Crop Science
Cite this
Stay-green in rice (Oryza sativa L.) of drought-prone areas in desiccated soils. / Hoang, Tien Ba; Kobata, Toru.
In: Plant Production Science, Vol. 12, No. 4, 09.11.2009, p. 397-408.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Stay-green in rice (Oryza sativa L.) of drought-prone areas in desiccated soils
AU - Hoang, Tien Ba
AU - Kobata, Toru
PY - 2009/11/9
Y1 - 2009/11/9
N2 - Stay-green in the post-anthesis period is thought to be an efficient drought-tolerance trait in crops, but its effectiveness in rice (Oryza sativa L.) is unknown. Our objectives were to determine whether the stay-green trait exists in rice cultivars in drought-prone areas. Twenty-four cultivars from Japan and Vietnam were grown in pots of 0.08 m in diameter and 1.00 m deep. At heading, irrigation was terminated in half of the pots and continued in the remaining pots. Every four days during the grain-filling period, we measured the leaf green color with a chlorophyll meter (SPAD), the green leaf area (GLA) and the fraction of transpirable soil water (FTSW). The capacity for maintenance of SPAD-value and GLA in desiccated soils was evaluated by determining the ratio of integrated SPAD-value and GLA in desiccated (D) plants to those in irrigated (I) plants (SPADD/I or GLAD/I, respectively). The SPADD/I and GLAD/I in 24 cultivars showed diverse frequency distributions. Cultivars belonging to higher ranges of the distribution in SPADD/I and GLAD/I tended to show higher ratios of plant dry weight at harvest in D to in I plants. SPADD/I and GLAD/I in the grain-filling period were poorly correlated with those in the seedling period in desiccated soils, and hence the capacity for maintenance of green leaves in the grain-filling period would differ from that in the seedling period. These results suggest that the stay-green trait exists as the capacity for maintaining green leaves and benefits dry matter production in desiccated soils in rice cultivars in drought-prone areas.
AB - Stay-green in the post-anthesis period is thought to be an efficient drought-tolerance trait in crops, but its effectiveness in rice (Oryza sativa L.) is unknown. Our objectives were to determine whether the stay-green trait exists in rice cultivars in drought-prone areas. Twenty-four cultivars from Japan and Vietnam were grown in pots of 0.08 m in diameter and 1.00 m deep. At heading, irrigation was terminated in half of the pots and continued in the remaining pots. Every four days during the grain-filling period, we measured the leaf green color with a chlorophyll meter (SPAD), the green leaf area (GLA) and the fraction of transpirable soil water (FTSW). The capacity for maintenance of SPAD-value and GLA in desiccated soils was evaluated by determining the ratio of integrated SPAD-value and GLA in desiccated (D) plants to those in irrigated (I) plants (SPADD/I or GLAD/I, respectively). The SPADD/I and GLAD/I in 24 cultivars showed diverse frequency distributions. Cultivars belonging to higher ranges of the distribution in SPADD/I and GLAD/I tended to show higher ratios of plant dry weight at harvest in D to in I plants. SPADD/I and GLAD/I in the grain-filling period were poorly correlated with those in the seedling period in desiccated soils, and hence the capacity for maintenance of green leaves in the grain-filling period would differ from that in the seedling period. These results suggest that the stay-green trait exists as the capacity for maintaining green leaves and benefits dry matter production in desiccated soils in rice cultivars in drought-prone areas.
KW - Drought
KW - Grain-filling period
KW - Rice
KW - Seedling period
KW - Stay-green
UR - http://www.scopus.com/inward/record.url?scp=70350638811&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70350638811&partnerID=8YFLogxK
U2 - 10.1626/pps.12.397
DO - 10.1626/pps.12.397
M3 - Article
AN - SCOPUS:70350638811
VL - 12
SP - 397
EP - 408
JO - Plant Production Science
JF - Plant Production Science
SN - 1343-943X
IS - 4
ER -