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Effect of post-anthesis water stress on remobilization of soluble carbohydrates from peduncle and penultimate internodes to the developing grains of two bread wheat cultivars
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Abstract: (3593 Views) |
| This research was conducted to investigate the effect of water stress during cell division (stage 1, water limitation from anthesis untill 14 days after anthesis), grain filling stage (stage 2, water limitation from 14 days after anthesis untill physiological maturity) and control (soil water at field capacity), on soluble carbohydrates remobilization from peduncle and penultimate. The experiment was carried out in greenhouse using two wheat cultivars Marvdasht and Zagross (sensitive and tolerant to post-anthesis water stress, respectively). A factorial experiment arrangement in randomized complete block design with three replications was used. All traits were estimated in five stages (7, 14, 21, 28 and 35 days after anthesis). Results showed that the amount and efficiency of soluble carbohydrates remobilization from penultimate was higher than peduncle, and greater in cv. Zagross. Water deficit significantly increased soluble carbohydrates remobilization from peduncle and penultimate to the developing grains. This increase in cv. Zagross was higher than cv. Marvdasht. The highest concentration of glucose, fructose and sucrose and fructans in peduncle and penultimate were observed at 7 and 14 days after anthesis, respectively. Concentration of these sugars in penultimate was higher than peduncle. When water stress was imposed in stage 1, the concentration of sugars decreased more significantly in peduncle and penultimate as compared to the other stages. Fructan was the most important sugar in the two internodes of the two cultivars. Glucose, fructose and sucrose are used for biosynthesis of fructans in early stages of grain filling. Considering the results of this experiment, starch had no significant role in remobilization to the growing grains. The contribution of penultimate in remobilization of sugars to the growing grains was higher than peduncle. Tolerance of cv. Zagross to water stress after anthesis could be attributed to its higher storage of sugars in stem and efficiency in remobilization of these sugars to the developing grains. |
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| Keywords: Bread wheat, Fructans, Fructose, Glucose, Remobilization, Soluble carbohydrates and Water stress. |
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Full-Text [PDF 438 kb]
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/17 | Accepted: 2015/02/17 | Published: 2015/02/17
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