Stay-green in rice (Oryza sativa L.) of drought-prone areas in desiccated soils

Tien Ba Hoang, Toru Kobata

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 languageEnglish
Pages (from-to)397-408
Number of pages12
JournalPlant Production Science
Volume12
Issue number4
DOIs
Publication statusPublished - Nov 9 2009
Externally publishedYes

Fingerprint

filling period
Oryza sativa
drought
rice
cultivars
soil
leaf area
leaves
rice soils
seedlings
heading
Vietnam
drought tolerance
dry matter accumulation
soil water
irrigation
Japan
flowering
chlorophyll
color

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 journalArticle

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