Does maintaining green leaf area in sorghum improve yield under drought? I. Leaf growth and senescence

Borrell, AK, Hammer, GL and Douglas, ACL (2000) Does maintaining green leaf area in sorghum improve yield under drought? I. Leaf growth and senescence. Crop Science, 40 4: 1026-1037. doi:10.2135/cropsci2000.4041026x

Author Borrell, AK
Hammer, GL
Douglas, ACL
Title Does maintaining green leaf area in sorghum improve yield under drought? I. Leaf growth and senescence
Journal name Crop Science   Check publisher's open access policy
ISSN 0011-183X
Publication date 2000-01-01
Year available 2000
Sub-type Article (original research)
DOI 10.2135/cropsci2000.4041026x
Open Access Status Not yet assessed
Volume 40
Issue 4
Start page 1026
End page 1037
Total pages 12
Place of publication MADISON
Language eng
Abstract Production of sorghum [Sorghum bicolor (L.) Moench], an important cereal crop in semiarid regions of the world, is often limited by drought. When water is limiting during the grain-filling period, hybrids possessing the stay-green trait maintain more photosynthetically active leaves than hybrids not possessing this trait. To improve yield under drought, knowledge of the extent of genetic variation in green leaf area retention is required. Field studies were undertaken in north-eastern Australia on a cracking and self-mulching gray clay to determine the effects of water regime and hybrid on the components of green leaf area at maturity (GLAM). Nine hybrids varying in stay-green were grown under a fully irrigated control, postflowering water deficit, and terminal (pre- and postflowering) water deficit. Water deficit reduced GLAM by 67% in the terminal drought treatment compared with the fully irrigated control. Under terminal water deficit, hybrids possessing the B35 and KS19 sources of stay-green retained more GLAM (1260 cm(2) plant(-1)) compared with intermediate (780 cm(2) plant(-1)) and senescent (670 cm(2) plant(-1)) hybrids. RQL12 hybrids (KS19 source of stay-green) displayed delayed onset and reduced rate of senescence; A35 hybrids displayed only delayed onset. Visual rating of green leaf retention was highly correlated with measured GLAM, although this procedure is constrained by an inability to distinguish among the functional mechanisms determining the phenotype. Linking functional rather than phenotypic differences to molecular markers may improve the efficiency of selecting for traits such as stay-green.
Keyword Agronomy
Subtropical Environments
Interactive Water
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 104 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 120 times in Scopus Article | Citations
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Created: Mon, 13 Aug 2007, 21:58:05 EST