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The response of Guava (Psidium guajava L.) Genotypes to Irrigation Regimes
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Saeedeh Mohebi   , Mansoore Shamili , Mostafa Ghasemi |
| University of Hormozgan |
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Abstract: (338 Views) |
The selection of drought tolerant genotypes is an efficient approach to overcome drought stress. A greenhouse factorial experiment as completely random design was conducted to evaluate the physiological and biochemical responses of guava seedlings to irrigation regimes during 2019. The treatments were included guava genotypes (15 genotypes) and irrigation regime (two levels). One-year-old guava seedlings were grown in research greenhouse of university of Hormozgan in plastic pots. The irrigation regimes (50 and 75% of the field capacity) were applied six weeks later. Ten weeks after irrigation regime treatments, the plants were irrigated by 75% of the field capacity for five weeks. Finally, morphological, physiological and biochemical traits were evaluated. Based on the results, 50% of the field capacity irrigation led to a decrease in the leaf relative water content, photosynthetic pigments (chlorophyll and carotenoids), protein, anthocyanin, chlorophyll fluorescence, stem diameter and length. Although, leaf specific weight, catalase and peroxidase activities, soluble and ion leakage had an increasing trend. Based on the results, AC-115, AC-114, AC-117 and AC-116 genotypes, the drought tolerant candidates under 50% of the field capacity irrigation, had the highest leaf specific weight, leaf relative water content, photosynthetic pigments, stem length and diameter. While AC-122 genotype, the drought sensitive candidate, had the lowest leaf specific weight, catalase activity and chlorophyll fluorescence as well as the highest ion leakage.
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| Keywords: Chlorophyll fluorescence, Drought stress, Ion leakage, Leaf specific weight |
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Full-Text [PDF 714 kb]
(75 Downloads)
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Type of Study: Research |
Subject:
Pomology
Received: 2024/07/15 | Accepted: 2025/01/21 | Published: 2025/01/21
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