Water deficit alters canopy structure but not photosynthesis in regrowing alfalfa (Medicago sativa L.)
Article
Article Title | Water deficit alters canopy structure but not photosynthesis in regrowing alfalfa (Medicago sativa L.) |
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ERA Journal ID | 5305 |
Article Category | Article |
Authors | Pembleton, Keith, Rawnsley, Richard P., Donaghy, Daniel J. and Volenec, Jeffrey J. |
Journal Title | Crop Science: a journal serving the international community of crop scientists |
Journal Citation | 49 (2), pp. 722-731 |
Number of Pages | 11 |
Year | 2009 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0011-183X |
1435-0653 | |
Digital Object Identifier (DOI) | https://doi.org/10.2135/cropsci2008.08.0456 |
Web Address (URL) | https://acsess.onlinelibrary.wiley.com/doi/full/10.2135/cropsci2008.08.0456 |
Abstract | Growth of alfalfa (Medicago sativa L.) following the correction of a water deficit will depend in part on the characteristics of the canopy grown during the water deficit. The current study was undertaken to determine the extent to which canopy structure and photosynthetic capacity are affected in alfalfa plants regrowing following defoliation while exposed to a water deficit. The effects of five levels of water application (100, 75, 50, 25, and 0% of the replacement water requirement) during the regrowth of two alfalfa cultivars with contrasting levels of fall dormancy was investigated in a controlled environment. Mass per shoot and shoots per plant were both significantly (P < 0.05) reduced by water applications 75% or less of the replacement water requirement. Dry matter accumulation was reduced in proportion to the level of the water deficit the plants were exposed to. The rate of CO2 assimilation and maximum efficiency of photosystem II were unaffected (P > 0.05) by water deficits except for the unwatered plants on which leaf senescence occurred. The only inhibition in the plants' capacity for photosynthesis from a water deficit was reduced leaf area. Shoot density and reduced overall canopy photosynthesis were the only canopy characteristics that were altered by water deficit in a way that could continue to inhibit plant growth following the correction of the water deficit. |
Keywords | dry matter; Alfalfa; Water deficit |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 300403. Agronomy |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Tasmanian Institute of Agriculture, Australia |
Purdue University, United States |
https://research.usq.edu.au/item/yy642/water-deficit-alters-canopy-structure-but-not-photosynthesis-in-regrowing-alfalfa-medicago-sativa-l
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