Mesophyll Abscisic Acid Restrains Early Growth and Flowering But Does Not Directly Suppress Photosynthesis. Issue 2 (25th March 2019)
- Record Type:
- Journal Article
- Title:
- Mesophyll Abscisic Acid Restrains Early Growth and Flowering But Does Not Directly Suppress Photosynthesis. Issue 2 (25th March 2019)
- Main Title:
- Mesophyll Abscisic Acid Restrains Early Growth and Flowering But Does Not Directly Suppress Photosynthesis
- Authors:
- Negin, Boaz
Yaaran, Adi
Kelly, Gilor
Zait, Yotam
Moshelion, Menachem - Abstract:
- Abstract : Basal green tissue ABA widely affects plant morphology, water relations, and growth, inhibiting early growth and flowering, and does not directly suppress photosynthesis in the short term. Abstract: Abscisic acid (ABA) levels increase significantly in plants under stress conditions, and ABA is thought to serve as a key stress-response regulator. However, the direct effect of ABA on photosynthesis and the effect of mesophyll ABA on yield under both well-watered and drought conditions are still the subject of debate. Here, we examined this issue using transgenic Arabidopsis ( Arabidopsis thaliana ) plants carrying a dominant ABA-signaling inhibitor under the control of a mesophyll-specific promoter ( FBPase::abi1-1, abbreviated to fa ). Under normal conditions, fa plants displayed slightly higher stomatal conductance and carbon assimilation than wild-type plants; however, these parameters were comparable following ABA treatment. These observations suggest that ABA does not directly inhibit photosynthesis in the short term. The fa plants also exhibited a variety of altered phenotypes under optimal conditions, including more vigorous initial growth, earlier flowering, smaller flowers, and delayed chlorophyll degradation. Furthermore, under optimal conditions, fa plant seed production was less than a third of that observed for the wild type. However, under drought conditions, wild-type and fa seed yields were similar due to a significant reduction in wild-type seed andAbstract : Basal green tissue ABA widely affects plant morphology, water relations, and growth, inhibiting early growth and flowering, and does not directly suppress photosynthesis in the short term. Abstract: Abscisic acid (ABA) levels increase significantly in plants under stress conditions, and ABA is thought to serve as a key stress-response regulator. However, the direct effect of ABA on photosynthesis and the effect of mesophyll ABA on yield under both well-watered and drought conditions are still the subject of debate. Here, we examined this issue using transgenic Arabidopsis ( Arabidopsis thaliana ) plants carrying a dominant ABA-signaling inhibitor under the control of a mesophyll-specific promoter ( FBPase::abi1-1, abbreviated to fa ). Under normal conditions, fa plants displayed slightly higher stomatal conductance and carbon assimilation than wild-type plants; however, these parameters were comparable following ABA treatment. These observations suggest that ABA does not directly inhibit photosynthesis in the short term. The fa plants also exhibited a variety of altered phenotypes under optimal conditions, including more vigorous initial growth, earlier flowering, smaller flowers, and delayed chlorophyll degradation. Furthermore, under optimal conditions, fa plant seed production was less than a third of that observed for the wild type. However, under drought conditions, wild-type and fa seed yields were similar due to a significant reduction in wild-type seed and no reduction in fa seed. These findings suggest that endogenous basal ABA inhibits a stress-escape response under nonstressed conditions, allowing plants to accumulate biomass and maximize yield. The lack of a correlation between flowering time and plant biomass combined with delayed chlorophyll degradation suggests that this stress-escape behavior is regulated independently and upstream of other ABA-induced effects such as rapid growth and flowering. … (more)
- Is Part Of:
- Plant physiology. Volume 180:Issue 2(2019)
- Journal:
- Plant physiology
- Issue:
- Volume 180:Issue 2(2019)
- Issue Display:
- Volume 180, Issue 2 (2019)
- Year:
- 2019
- Volume:
- 180
- Issue:
- 2
- Issue Sort Value:
- 2019-0180-0002-0000
- Page Start:
- 910
- Page End:
- 925
- Publication Date:
- 2019-03-25
- Subjects:
- Plant physiology -- Periodicals
Botany -- Periodicals
Periodicals
Electronic journals
571.2 - Journal URLs:
- https://academic.oup.com/plphys/issue ↗
http://www.plantphysiol.org/ ↗
http://www.jstor.org/journals/00320889.html ↗
http://www.pubmedcentral.nih.gov/tocrender.fcgi?journal=69 ↗
http://www-us.ebsco.com/online/direct.asp?JournalID=101725 ↗
http://www.oxfordjournals.org/ ↗ - DOI:
- 10.1104/pp.18.01334 ↗
- Languages:
- English
- ISSNs:
- 0032-0889
- Deposit Type:
- Legaldeposit
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- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 22699.xml