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Discovery on Asynchrony of Ovule Initiation and Its Regulation Mechanism

December 31, 2020      Author:

Recently, the research team led by Lin Wenhui from School of Life Sciences and Biotechnology, SJTU published a paper titled "Asynchrony of ovule primordia initiation in Arabidopsis" in high-impact journal Development, elucidating the asynchrony and regulation mechanism of ovule initiation. The first author is doctoral student Yu Shixia from School of Life Sciences and Biotechnology, SJTU, and the corresponding author is researcher Lin Wenhui from School of Life Sciences and Biotechnology, SJTU. Other researchers taking part in their research include Dr. Zhou Lvwen and Dr. Feng Shiliang from Ningbo University, researcher Jiao Yuling from Institute of Genetics and Developmental Biology, and researcher Xu Lin from CAS Center for Excellence in Molecular Plant Sciences.

Plant ovule initiation determines the maximum of ovule number and has a great impact on the seed number per fruit. Understanding the regulation mechanism of ovule initiation not only advances the development of science, but also enjoys a promising application prospect. However, currently little research has been carried out in this respect.

This research discovered the asynchrony of ovule initiation, indicating the asynchronicity in the growth of different groups of ovule primordia on the same placentae, and made further exploration of the regulation mechanism of ovule initiation. That ovule primordia initiate asynchronously is of great biological importance, because plants could determine whether there is enough nutrition and a sound environment for a new group of primordia initiation by monitoring the current distance among ovules, and further control the number of its filial generation. 

Their research has been sponsored by the National Natural Science Foundation of China, the Open Project of State Key Laboratory of Plant Molecular Genetics, Foundation of Agri-X and Bio-X Institute of SJTU, as well as SJTU Science Innovation Foundation.

 

Author: School of Life Sciences and Biotechnology

Affiliation: School of Life Sciences and Biotechnology, SJTU

Translated by Zhang Wenying

Proofread by Xiao Yangning, Fu Yuhe


ABSTRACT:

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