Published by The Company of Biologists Ltd. Taken together, our results illustrate that the ovule primordia initiate asynchronously and the hormone signals are involved in the asynchrony.Īsynchrony Auxin Brassinosteroid Ovule initiation. Transcriptomic analysis demonstrates numerous known regulators of ovule development and hormone signaling, and many new genes are identified that are involved in ovule development. Brassinosteroid signaling positively regulates ovule number by promoting placentae size and ovule primordia initiation through strengthening auxin response. We have established computational modeling to show how auxin dynamics influence ovule primordia initiation. PIN-FORMED1 polar distribution and auxin response maxima correlate with ovule primordia asynchronous initiation. The expression pattern of different marker genes during ovule development illustrates that this asynchronicity continues throughout whole ovule development. The first group of ovule primordia grows out, the placenta elongates, the boundaries of existing ovules enlarge and a new group of primordia initiates from the boundaries. Here, we report that ovules initiate asynchronously. The detailed processes of ovule initiation have not been accurately described, although two connected processes, gynoecium and ovule development, have been investigated. Plant ovule initiation determines the maximum of ovule number and has a great impact on the seed number per fruit.
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