Details
| Original language | English |
|---|---|
| Pages (from-to) | 7-15 |
| Number of pages | 9 |
| Journal | Scientia horticulturae |
| Volume | 110 |
| Issue number | 1 |
| Early online date | 13 Jul 2006 |
| Publication status | E-pub ahead of print - 13 Jul 2006 |
Abstract
The adaptation to drought stress of two African nightshade species, Solanum villosum and S. sarrachoides was investigated in pot and field experiments between 2000 and 2002. Two genotypes of S. villosum (landrace and commercial) and one accession of S. sarrachoides were grown under droughted, moderate stress and well-watered conditions. Leaf expansion, stem elongation and transpiration began to decline early in the drying cycle with fraction of transpirable soil water (FTSW) thresholds of 0.46-0.64. Osmotic adjustment (OA) of both species was in the range of 0.16-0.19 MPa and could not maintain positive turgor below water potentials of -1.80 to -2.04 MPa. The responses evaluated were similar in the three genotypes suggesting similar strategies of adaptation to drought stress. Under field conditions, the S. sarrachoides accession showed a higher leaf area than the S. villosum commercial genotype. It is concluded that the three African nightshade genotypes have limited OA capacity and adapt to drought mainly by regulating transpiration. This was achieved by reduction of leaf area. In general, it is necessary to maintain FTSW above 0.5-0.6 to prevent decline in leaf expansion, stem elongation, and transpiration.
Keywords
- Fraction of transpirable soil water, Leaf expansion, Normalized transpiration ratio, Osmotic adjustment, Relative water content, Water potential
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Horticulture
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In: Scientia horticulturae, Vol. 110, No. 1, 13.07.2006, p. 7-15.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Plant growth, water relations and transpiration of two species of African nightshade (Solanum villosum Mill. ssp. miniatum (Bernh. ex Willd.) Edmonds and S. sarrachoides Sendtn.) under water-limited conditions
AU - Masinde, P. W.
AU - Stützel, H.
AU - Agong, S. G.
AU - Fricke, A.
PY - 2006/7/13
Y1 - 2006/7/13
N2 - The adaptation to drought stress of two African nightshade species, Solanum villosum and S. sarrachoides was investigated in pot and field experiments between 2000 and 2002. Two genotypes of S. villosum (landrace and commercial) and one accession of S. sarrachoides were grown under droughted, moderate stress and well-watered conditions. Leaf expansion, stem elongation and transpiration began to decline early in the drying cycle with fraction of transpirable soil water (FTSW) thresholds of 0.46-0.64. Osmotic adjustment (OA) of both species was in the range of 0.16-0.19 MPa and could not maintain positive turgor below water potentials of -1.80 to -2.04 MPa. The responses evaluated were similar in the three genotypes suggesting similar strategies of adaptation to drought stress. Under field conditions, the S. sarrachoides accession showed a higher leaf area than the S. villosum commercial genotype. It is concluded that the three African nightshade genotypes have limited OA capacity and adapt to drought mainly by regulating transpiration. This was achieved by reduction of leaf area. In general, it is necessary to maintain FTSW above 0.5-0.6 to prevent decline in leaf expansion, stem elongation, and transpiration.
AB - The adaptation to drought stress of two African nightshade species, Solanum villosum and S. sarrachoides was investigated in pot and field experiments between 2000 and 2002. Two genotypes of S. villosum (landrace and commercial) and one accession of S. sarrachoides were grown under droughted, moderate stress and well-watered conditions. Leaf expansion, stem elongation and transpiration began to decline early in the drying cycle with fraction of transpirable soil water (FTSW) thresholds of 0.46-0.64. Osmotic adjustment (OA) of both species was in the range of 0.16-0.19 MPa and could not maintain positive turgor below water potentials of -1.80 to -2.04 MPa. The responses evaluated were similar in the three genotypes suggesting similar strategies of adaptation to drought stress. Under field conditions, the S. sarrachoides accession showed a higher leaf area than the S. villosum commercial genotype. It is concluded that the three African nightshade genotypes have limited OA capacity and adapt to drought mainly by regulating transpiration. This was achieved by reduction of leaf area. In general, it is necessary to maintain FTSW above 0.5-0.6 to prevent decline in leaf expansion, stem elongation, and transpiration.
KW - Fraction of transpirable soil water
KW - Leaf expansion
KW - Normalized transpiration ratio
KW - Osmotic adjustment
KW - Relative water content
KW - Water potential
UR - http://www.scopus.com/inward/record.url?scp=33747496722&partnerID=8YFLogxK
U2 - 10.1016/j.scienta.2006.06.003
DO - 10.1016/j.scienta.2006.06.003
M3 - Article
AN - SCOPUS:33747496722
VL - 110
SP - 7
EP - 15
JO - Scientia horticulturae
JF - Scientia horticulturae
SN - 0304-4238
IS - 1
ER -