10/7/2023 0 Comments Pruning pepper plants download![]() ![]() This indicates that although most of the variation in abortion can be related to the source and sink strength of the plant, some effects of competing fruits can only be explained by a combination of competition and dominance.Ībscission, Capsicum annuum, competition, dominance, flower abortion, fruit abortion, fruit set, source–sink IntroductionĪbscission of flower buds, flowers, and fruits is an important yield-limiting factor in many crops including pepper ( Wien et al., 1989 a). ![]() However, with the same vegetative growth rate, the rate of abortion was lower for the leaf pruning treatments where no competing fruits were retained than for the fruit load treatments. Most of the variation in abortion could be related to differences in vegetative growth rate, the latter being an indicator of the source–sink ratio. With the same source strength, the rate of abortion showed a close relationship with the growth rate of the earlier formed competing fruits, suggesting that the induction of abortion by earlier formed fruits is due to their sink strength. That flower and fruit abortion not only depends on the source strength but also on the sink strength of competing organs is shown by varying the number or the position of earlier formed fruits. The different experiments where source strength was varied all showed that when source strength decreased, the rate of abortion increased linearly, whether source strength was decreased by shading, high plant density, or leaf pruning. ![]() ![]() Shading as well as heating for short periods showed that flowers/fruits were the most susceptible to abortion during the first week after anthesis. Sink strength was varied by changing the temperature and the number and position of earlier formed fruits. Source strength was varied by changing the light level, plant density, and leaf pruning. Source strength (assimilate supply) and sink strength (assimilate demand) of the plant were varied in different ways to investigate to what extent flower/fruit abortion in sweet pepper ( Capsicum annuum L.) is determined by the availability of assimilates. ![]()
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