The Trade-offs of Resource Utilization and Energy Output Between Seed Germination Behavior and Cotyledon Function of Plants
Plants require resources for various life activities such as seed germination and cotyledon growth,and competition arises when facing limited resources.How to optimally allocate limited resources to cotyledons in different stages and with different ratios is one of the current hot topics in ecological re-search.This article takes Achnatherum sibiricum,Serratula centauroides,and Carduus crispus as research objects,using morphological and physiological indicators to study seed and seedling growth,monitoring the dynamic changes in resource allocation.The results show that different times and burial depths have different effects on seed germination behavior,and there are also significant differences in the impact on seedling and cotyledon morphology and function.When the seeds are buried at a depth of 0.5 cm,the germination rate of Achnatherum sibiricum is the highest,reaching 93.3%,much higher than that of Serratula centauroides and Carduus crispus seeds.The water content of Carduus crispus seeds is higher,and their germination rate is relatively low.The stem and root lengths of Achnatherum sibiricum,Serratula centauroides,and Carduus crispus seedlings increase with increasing burial depth.With the increase in burial depth,the starch enzyme activity of Achnatherum sibiricum cotyledons decreases,but it is still higher than that of the seed.The opposite is true for Serratula centauroides cotyledons,while the change trend of starch enzyme activity in Carduus crispus cotyledons is similar to that of Achnatherum sibiricum.Different times and burial depths have significant effects on the SOD enzyme activity of Achnatherum sibiricum and Serratula centauroides cotyledons.Over time,the SOD enzyme activity of Carduus crispus cotyledons changes significantly,but it is not significantly affected by burial depth.
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