نتایج جستجو برای: plants pattern
تعداد نتایج: 539773 فیلتر نتایج به سال:
In plants, the arrangement of organs along the stem (phyllotaxy) follows a predictable pattern. Recent studies have shown that primordium position at the meristem is governed by local auxin gradients, but little is known about the subsequent events leading to the phyllotaxy along the mature stem. We show here that plants expressing a miR164-resistant CUP-SHAPED COTYLEDON2 (CUC2) gene have an ab...
In this paper I examine the effects that the competitive environment in which plants are grown and the timing of herbivore damage have on the expression and pattern of selection acting on plant tolerance to herbivory and resistance to herbivores. I conducted a field experiment involving 720 plants from 24 full-sib families of the common morning glory, Ipomoea purpurea. Plants were grown in one ...
Non-photosynthetic, or heterotrophic, tissues in C3 plants tend to be enriched in C compared with the leaves that supply them with photosynthate. This isotopic pattern has been observed for woody stems, roots, seeds and fruits, emerging leaves, and parasitic plants incapable of net CO2 fixation. Unlike in C3 plants, roots of herbaceous C4 plants are generally not C-enriched compared with leaves...
BACKGROUND Exotic species have been hypothesized to successfully invade new habitats by virtue of possessing novel biochemistry that repels native enemies. Despite the pivotal long-term consequences of invasion for native food-webs, to date there are no experimental studies examining directly whether exotic plants are any more or less biochemically deterrent than native plants to native herbivo...
A 200-day study was carried out to investigate the impact of transgenic Bacillus thuringiensis (Bt) corn on immature and adult Lumbricus terrestris in the field and in the laboratory. Another objective of this study was to develop test methods that could be used for standard testing of the impact of transgenic plants on different earthworm species in the field and in the laboratory. For this pu...
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