Abstract:
:Production per amount of water used (water use efficiency, WUE) is closely correlated with drought tolerance. Although stomatal aperture can regulate WUE, the underlying molecular mechanisms are still unclear. Previous reports revealed that stomatal closure was inhibited in the calcium-sensing receptor (CAS) antisense line of Arabidopsis (CASas). Here it is shown that decreased drought tolerance and WUE of CASas was associated with higher stomatal conductance due to improper regulation of stomatal aperture, rather than any change of stomatal density. CASas plants also had a lower CO2 assimilation rate that was attributed to a lower photosynthetic electron transport rate, leading to higher chlorophyll fluorescence. Gene co-expression combined with analyses of chlorophyll content and transcription levels of photosynthesis-related genes indicate that CAS is involved in the formation of the photosynthetic electron transport system. These data suggest that CAS regulates transpiration and optimizes photosynthesis by playing important roles in stomatal movement and formation of photosynthetic electron transport, thereby regulating WUE and drought tolerance.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Wang WH,Chen J,Liu TW,Chen J,Han AD,Simon M,Dong XJ,He JX,Zheng HLdoi
10.1093/jxb/ert362subject
Has Abstractpub_date
2014-01-01 00:00:00pages
223-34issue
1eissn
0022-0957issn
1460-2431pii
ert362journal_volume
65pub_type
杂志文章abstract::Brassinosteroids (BRs) are a group of steroid hormones regulating plant growth and development. Since BRs do not undergo transport among plant tissues, their metabolism is tightly regulated by transcription factors (TFs) and feedback loops. BAS1 (CYP734A1, formerly CYP72B1) and SOB7 (CYP72C1) are two BR-inactivating c...
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更新日期:2012-10-01 00:00:00
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journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
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更新日期:2006-01-01 00:00:00
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