The reduction of foliar area can cause yield reduction in common bean crops. The objective of this work was to verify which is the effect of different defoliation levels realized in several development stages of commo...The reduction of foliar area can cause yield reduction in common bean crops. The objective of this work was to verify which is the effect of different defoliation levels realized in several development stages of common bean (Phaseolus vulgaris L. cv. Goytacazes) over yield, weight of 100 seeds and number of pods per plant. The experimental design was randomized blocks, in a split-plot arrangement with five replications. The plot corresponded to the five defoliation epochs (first trifoliate leaf, flowering, pods formation, pods filling, and dry pods). In each plot, the split plot was represented by the four defoliation levels (0%, 33%, 67% and 100%). It was observed a decrease of yield for all levels defoliation considering all development stages, except for dried pods. The highest decrease was detected for flowering and pods formation. Through the regression analysis got a greater reduction in yield with 100% defoliation made at 42 days after emergence. The evaluation parameter that showed better relation with yield was a number of pods per plant.展开更多
菜豆在货架期易出现豆粒淀粉化而导致的衰老,品质下降。采用不同浓度(0,0.02,0.2,0.5,1.0 mmol/L)外源亚精胺结合脉冲负压(-20 k Pa)渗透处理菜豆,研究外源亚精胺对菜豆豆粒淀粉含量的影响以及衰老相关的抗氧化酶的影响。试验结果表明,...菜豆在货架期易出现豆粒淀粉化而导致的衰老,品质下降。采用不同浓度(0,0.02,0.2,0.5,1.0 mmol/L)外源亚精胺结合脉冲负压(-20 k Pa)渗透处理菜豆,研究外源亚精胺对菜豆豆粒淀粉含量的影响以及衰老相关的抗氧化酶的影响。试验结果表明,外源亚精胺脉冲负压渗透处理可以延缓菜豆豆粒的软化,抑制淀粉含量及α-淀粉酶活性的上升。贮藏至第8天时,经0.5 mmol/L的外源亚精胺脉冲负压渗透处理的豆粒的淀粉含量和α-淀粉酶活性分别比对照低35%和32%。外源亚精胺脉冲负压渗透处理的豆粒衰老相关的抗氧化酶活性也受到不同程度的抑制,贮藏至第2天和第4天时,经0.5 mmol/L外源亚精胺脉冲负压渗透处理的豆粒的多酚氧化酶和过氧化物酶的活性分别比对照低44%和21%。外源亚精胺结合脉冲负压处理有效地延缓了菜豆豆粒的衰老进程,为防治菜豆豆粒品质劣变提供理论基础和应用依据。展开更多
文摘The reduction of foliar area can cause yield reduction in common bean crops. The objective of this work was to verify which is the effect of different defoliation levels realized in several development stages of common bean (Phaseolus vulgaris L. cv. Goytacazes) over yield, weight of 100 seeds and number of pods per plant. The experimental design was randomized blocks, in a split-plot arrangement with five replications. The plot corresponded to the five defoliation epochs (first trifoliate leaf, flowering, pods formation, pods filling, and dry pods). In each plot, the split plot was represented by the four defoliation levels (0%, 33%, 67% and 100%). It was observed a decrease of yield for all levels defoliation considering all development stages, except for dried pods. The highest decrease was detected for flowering and pods formation. Through the regression analysis got a greater reduction in yield with 100% defoliation made at 42 days after emergence. The evaluation parameter that showed better relation with yield was a number of pods per plant.
