Girousse Christine, Faucher Mireille, Kleinpeter Camille, Bonnemain Jean-Louis
Unité de Recherches de Zoologie, INRA, Route de Saintes, F-86600 Lusignan, France.
Laboratoire de Biologie et Physiologie Végétales, UMR-CNRS 6161, Université de Poitiers, 25, rue du Faubourg Saint-Cyprien, F-86000 Poitiers, France.
New Phytol. 2003 Jan;157(1):83-92. doi: 10.1046/j.1469-8137.2003.00659.x.
• The short-term effects (24 h infestation) of the pea aphid on C-assimilate partitioning and stem elongation rate (SER) of alfalfa were investigated in relation to possible mechanisms (nutrient removal, mechanical or chemical stimuli) involved in the impact of the aphid on plants. • Different combinations of aphid numbers, developmental stages and location on the stem were tested on both SER and C-assimilate partitioning within the plant overall, and in the various compartments of the growth zone (GZ): apex, apical bud and elongating internodes. • Stem elongation rate reduction could be related quantitatively to assimilate withdrawal but did not depend on this parameter only. In the case of moderate aphid infestations located not only on but also below the GZ, the inhibition of assimilate allocation to the compartments of the GZ increased acropetally. The apex, a sink with mitosis and organogenesis activities, was dramatically affected. • These results are consistent with the development of an 'inhibition-competition' mechanism resulting from reduced apical sink strength through the propagation of signals triggered by aphid feeding.
• 研究了豌豆蚜对苜蓿碳同化分配和茎伸长率（SER）的短期影响（24小时侵染），探讨了蚜虫影响植物的可能机制（营养去除、机械或化学刺激）。• 测试了不同蚜虫数量、发育阶段和在茎上位置的组合对植物整体以及生长区（GZ）各个部分（顶端、顶芽和伸长节间）的SER和碳同化分配的影响。• 茎伸长率的降低在数量上可能与同化物的消耗有关，但不仅仅取决于这个参数。在中等蚜虫侵染的情况下，不仅在GZ上而且在GZ以下，同化物向GZ各部分的分配抑制向顶增加。顶端作为具有有丝分裂和器官发生活动的库，受到了显著影响。• 这些结果与通过蚜虫取食引发的信号传播导致顶端库强度降低而产生的“抑制-竞争”机制的发展相一致。
