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Investigation the effect of water deficiency tension on photosynthetic indices and yield of genotypes forage sorghum (Sorghum bicolor)
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M. Ghahremani   , A. Ebadi , Gh. Parmoon * , S. Jahanbakhsh |
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Abstract: (4626 Views) |
| According to limited availability of water for crops production, fining genotypes with optimal efficiency of water use is among the research priorities. For this purpose this research was conducted in order to investigate the effect of water deficiency tension on photosynthesis indices and finally production and forage yield of three sorghum genotypes as factorial in a completely randomized design in University of Mohaghegh Ardabili research greenhouse in 2013. The experiment treatments consisted of water deficiency tension at four levels (80, 65, 45 and 25% of field capacity) and three genotypes of sorghum (KFS17, KFS6 and KFS2). The results showed that the main effect of water deficit tension and genotype had significant difference in most measured traits at one percentage probability level. Interaction between water deficit tension and sorghum genotype was significant only on the amount of chlorophyll a, carotenoids, chlorophyll stability and forage yield. So that the deficit water tension caused decreasing of chlorophyll a, b, total chlorophyll, maximal fluorescence (Fm), quantum yield of photo system II (Fv/Fm) and forage yield and caused increasing in chlorophyll a to b ratio, carotenoids, chlorophyll stability, Fo (minimal fluorescence in dark adapted conditions), Ft (fluorescence intensity or instantaneous). Although KFS6 genotype had the highest value in many of the measured traits, however, the highest yield was belonged to KFS2 genotype and then KFS17. Also based on regression analysis the KFS17 genotype showed the highest correlation between chlorophyll a, total chlorophyll and carotenoid amounts with the yield. Generally, yield reduction in KFS2 genotype can be related to consume more plant photosynthesis materials in order to withstand against the tension. |
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| Keywords: Photosynthesis pigments, Chlorophyll fluorescence, Deficit water tension. |
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Full-Text [PDF 406 kb]
(3774 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2015/07/26 | Accepted: 2015/07/26 | Published: 2015/07/26
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