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Evaluation of the physiological reaction of wheat genotypes to cold tension at tillering stage
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M. Tavoosi *   , A. Naderi , GH. Lotfali-Ayeneh |
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Abstract: (4138 Views) |
| In Khouzestan, reduce temperature in January and Februaryis a dominant climate phenomenon that causes damage to the plant and thus the yield. In this research the effect of cold tension in tillering stage on yield, yield components and some phonological and physiological traits was investigated in a factorial experiment under controlled greenhouse conditions with five wheat genotypes (cultivars Chamran, Virinak, Star, Karkheh and line M-83-17) and at four ambient temperatures (no cold, +3, 0, -3 C°) in a completely randomized design with three replications. The results showed there was a significant difference among genotypes in terms of cold tolerance and the genotypes difference and the effect of cold and their interactions on yield and yield components and some physiological traits was significant. At no tension conditions and 0 C° temperature the highest grain yield was belonged to line M-83-17 at rates 0.8 and 0.3 gram in main stem, respectively and Star cultivar at +3 and -3 C° temperatures with 0.4 and 0.45 gram in main stem, respectively. The lowest fluorescence reduction was observed at least, at Chamran cultivar at 0 C° tension and the lowest fluorescence increase, maximum in Chamran cultivar at -3 C° tension. The maximum photochemical photosystem II efficiency was observed in Star cultivar. According to SSI and STI indices, Star and Chamran cultivars had more sustainability yield in cold tensions. The changes of investigated traits in the studied genotypes shows different reaction of genotypes which itself is due to genetic diversity of these genotypes. |
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| Keywords: Chlorophyll fluorescence index, Grain yield, Photochemical efficiency, Wheat. |
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Full-Text [PDF 279 kb]
(3394 Downloads)
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Type of Study: Research |
Subject:
Crop Physiology
Received: 2014/11/19 | Accepted: 2014/11/19 | Published: 2014/11/19
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