Ali, Z.I. and Golombek, S.D.
(2016)
Effect of drought and nitrogen availability on osmotic
adjustment of five pearl millet cultivars in the vegetative
growth stage.
Journal of Agronomy and Crop Science, 202 (6).
pp. 433-444.
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Abstract
Growth of pearl millet (Pennisetum glaucum (L.) R. Br.) is affected in areas with
limited and erratic rainfall, often combined with nitrogen deficiency. Therefore,
effects of severe drought and nitrogen availability on mechanisms of dehydration
avoidance were investigated. Five pearl millet genotypes were cultivated in soil
differing in nitrogen availability, low (N1), medium (N2) or high (N3) in a climate
chamber. Thirty-five days after sowing, the plants were exposed to drought
for 12 days. Drought decreased leaf area and stomatal conductance strongly and
caused leaf rolling. In the youngest fully expanded leaves, drought led to an
osmotic adjustment from around -0.5 to -0.9 MPa, in N1 and N2 substantially
achieved by potassium accumulation. Nitrate contributed to the osmotic adjustment
in N2 and N3, proline only slightly, increasingly from N1 to N2, whereas
the sum of glucose, fructose and sucrose did not play a role. The dehydration
independent osmotic force for water uptake (osmotic potential at full turgor)
was under drought strongest at N2 and in the landrace Dembi Yellow stronger
than in the cultivars Ashana and Ugandi. This contributed to the higher relative
water content (RWC) of ‘Dembi Yellow’, whereas due to other factors nitrogen
had no effect on the RWC.
| Item Type: |
Article
|
| Uncontrolled Keywords: |
Drought; nitrogen nutrition; osmotic
adjustment; pearl millet |
| Author Affiliation: |
Organic Agriculture and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Witzenhausen, Germany |
| Subjects: |
Plant Production |
| Divisions: |
Millet |
| Depositing User: |
Mr T L Gautham
|
| Date Deposited: |
18 Jan 2019 10:58 |
| Last Modified: |
18 Jan 2019 10:58 |
| URI: |
http://eprints.icrisat.ac.in/id/eprint/15772 |
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