The Effects Of Leaf Remove In Different Ontogenic Stage Of Life History On Growth & Reproduction In Medicago Lupulina

Herbivory of plant species is one of the pressure on plant growth, establishment &reproduction, as well as the diversity of communities may have a profound impact. In this study, Medicago lupulina as materials, simulation cotyledons, seedlings &breeding period of leaf herbivory effects on fitness. Our results show that:1 Seedling cotyledon removal treatment during seedling period did not significantly affect mortality, beyond the cotyledon stage in different periods of leaf removal did not result in plant death.2 Seedling establishment phase, namely germination for 5 weeks (35d), cotyledon stage of the two periods of 100% of cotyledon removal treatment on plant growth both have very significant effect,&in the earlier period (7d) of treatment the greatest impact, significantly reduced biomass, late period (14d) treatment also significantly reduced growth.3 Cotyledon stage of two periods (7d,14d) 100% cotyledon removal treatment&at different stages of &life history of the first period (7d) 50% of the cotyledons removed were significantly reduced final biomass of Medicago lupulina, other times such as cotyledon litter period (5 weeks), first flowering period (8 weeks), peak flowering period (11 weeks) of treatment on the final biomass had no significant effect.4 All of the cotyledon removal treatment of cotyledon stage significantly increased the the flowering time of Medicago lupulina, treatment of two periods (7d&14d) were significantly prolonged the time required for first flowering. Cotyledon stage of the first period (7d) of cotyledon removal significantly reduced the number of individual inflorescence, the second period (14d) treatment had no obvious effect on the number of inflorescence.5 Cotyledon stage of the first period (7d) 100% of cotyledon removal &the 50% cotyledon removed of 7d treatment were significantly reduces the number of individual seeds &total seed weight, The second period (14d) treatment (100%) of cotyledon stage &different developmental stages of life history of other periods, such as litter cotyledon stage, flowering, peak flowering period of treatment on seed number &seed weight had no significant effect.6, Covariance analysis results show that:for cotyledon stage (7d,14d) of 100% cotyledon removal treatment, the time required for the first flowering directly affected by the deal, inflorescence number, seed number, seed weight is size dependent. Treatment at different stages of life history, the cotyledon stage to 50% of the cotyledon removal treatment resulted in reduction of the number of seed &seed weight,&this is affected both by plant size &the deal.