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F. Dubert M. Filek I. Marcinska A. Skoczowski 《Journal of Agronomy and Crop Science》1992,168(2):133-141
Excised embryos of winter wheat were submitted to a different number of vernalization (2 °C) and devernalization (20 °C) cycles of different lengths. In all treatments sum of cold and warm intervals was 50 and 10 days, respectively. The influence of different temperature conditions of seedling growth on the effectiveness of vernalization and correlations between effectiveness of vernalization and final content of phospholipid fatty acids were analyzed.
All indexes of generative development of plants (length of vegetative phase, % of generative plants, number of side shoots) showed the most effective was uninterrupted vernalization beginning immediately after excision of embryos. Increasing the number of 2 ° C/20 °C cycles rapidly depressed effectiveness of vernalization, which reached the minimum with the 8.3 days at 2 °C and 2 days at 20 °C cycle and then improved again as cycles became shorter and more numerous.
Correlations between indexes of generative plant growth and indexes describing composition of fatty acids in seedlings showed that from 50 % to 60 % of variability in the composition of phospholipid can be associated with changes in the degree of generative induction. A higher degree of generative induction was associated with a higher share of < 16, 16: 0 and 18:2 acids and a lower share of 18: 3 acid and also with a lower value of the 16: 0/< 16 ratio of phospholipids.
The relation between the generative induction of plants and the composition of phospholipid fatty acids may however be blurred when induction proceeds under conditions of alternate short spells of vernalization and devernalization temperatures. 相似文献
All indexes of generative development of plants (length of vegetative phase, % of generative plants, number of side shoots) showed the most effective was uninterrupted vernalization beginning immediately after excision of embryos. Increasing the number of 2 ° C/20 °C cycles rapidly depressed effectiveness of vernalization, which reached the minimum with the 8.3 days at 2 °C and 2 days at 20 °C cycle and then improved again as cycles became shorter and more numerous.
Correlations between indexes of generative plant growth and indexes describing composition of fatty acids in seedlings showed that from 50 % to 60 % of variability in the composition of phospholipid can be associated with changes in the degree of generative induction. A higher degree of generative induction was associated with a higher share of < 16, 16: 0 and 18:2 acids and a lower share of 18: 3 acid and also with a lower value of the 16: 0/< 16 ratio of phospholipids.
The relation between the generative induction of plants and the composition of phospholipid fatty acids may however be blurred when induction proceeds under conditions of alternate short spells of vernalization and devernalization temperatures. 相似文献
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为了解决甘蓝遏低温先期抽薹的难题,本试验采用37℃高温进行春化逆转,以低温春化的植株作为对照,探讨甘蓝体内蛋白酶活性与春化逆转的关系.甘蓝早熟品种"8398"和中熟品种"京丰"经春化逆转,可溶性蛋白含量、硝酸还原酶(NR)、过氧化物酶(POD)和过氧化氢酶(CAT)活性比正常春化的植株分别下降了13.1和6.6mg/g,26.5和45.9μg/(g·h),19.8和17.1μg/(g·min),11.6和9.6 U/(g·min).试验发现,早熟品种"8398"其体内可溶性蛋白含量、POD、CAT活性的降低幅度均比中熟品种"京丰"更大些;而中熟品种"京丰"体内NR活性比早熟品种"8398"活性强.结果表明,低水平的可溶性蛋白舍量、POD、CAT、NR活性有利于春化逆转的完成. 相似文献
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以结球甘蓝早熟品种8398和中熟品种京丰1号为试材,分别在植株长至7片和9片真叶时进行绿体春化处理18和21d,再进行37℃高温春化逆转12h,研究结球甘蓝高温春化逆转过程中内源激素含量的变化。结果表明:在高温春化逆转过程中,结球甘蓝植株体内GA3含量变化不大,IAA含量呈上升趋势,ABA含量呈下降趋势。与低温春化的对照相比,在高温春化逆转结束时,GA3和ABA含量显著降低,而IAA含量显著升高。低水平的GA3和ABA含量和高水平的IAA含量有利于春化逆转完成。 相似文献
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