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Genetic Evidence for the Role of a Rice Vacuolar Invertase as a Molecular Sink Strength Determinant

Overview of attention for article published in Rice, January 2018
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Title
Genetic Evidence for the Role of a Rice Vacuolar Invertase as a Molecular Sink Strength Determinant
Published in
Rice, January 2018
DOI 10.1186/s12284-018-0201-x
Pubmed ID
Authors

Shamitha Rao Morey, Tatsuro Hirose, Yoichi Hashida, Akio Miyao, Hirohiko Hirochika, Ryu Ohsugi, Junko Yamagishi, Naohiro Aoki

Abstract

Rice is a major crop feeding the majority of the global population, and increasing its sink strength is one of the modes to alleviate the declining availability of food for the rapidly growing world population. We demonstrate a role for an important rice vacuolar invertase isoform, OsINV3, in sink strength determination. OsINV3 mutants showed shorter panicles with lighter and smaller grains, owing to a smaller cell size on the outer and inner surfaces of the palea and lemma as observed by scanning electron microscopy. Further, strong promoter::GUS expression was observed in the palea, lemma and the rachis branches in the young elongating panicles, which supported the role of OsINV3 in cell expansion and thus, in spikelet size and panicle length determination. Size of the spikelet was found to directly influence the grain weight, which was confirmed by the lack of differences in weights of hulled grain for differently segregated alleles in the heterozygous lines. Assessment of field grown mutants not only revealed a drastic reduction in the percentage of ripened grain, 1000-grain weight and final yield, but also significantly reduced partitioning of assimilates to the panicles, whereby the total dry weight remained unaffected. Determination of the non-structural carbohydrate contents revealed a lower hexose-to-sucrose ratio in the panicles of the mutants from panicle initiation to 10 days after heading, a stage that identifies as the critical pre-storage phase of grain filling, whereas the starch contents were not affected. In addition, strong promoter::GUS expression was observed in the dorsal end of ovary during the pre-storage phase until 6 days after flowering, highlighting a function for OsINV3 in monitoring the initial grain filling stage. OsINV3 was found to regulate spikelet size by playing a key role in cell expansion, driving the movement of assimilates for grain filling by modulating the hexose-to-sucrose ratio, contributing in grain weight determination and thus, the grain yield.

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Geographical breakdown

Country Count As %
Unknown 46 100%

Demographic breakdown

Readers by professional status Count As %
Researcher 7 15%
Student > Bachelor 6 13%
Student > Ph. D. Student 5 11%
Student > Doctoral Student 3 7%
Professor 2 4%
Other 7 15%
Unknown 16 35%
Readers by discipline Count As %
Agricultural and Biological Sciences 17 37%
Biochemistry, Genetics and Molecular Biology 8 17%
Business, Management and Accounting 1 2%
Arts and Humanities 1 2%
Nursing and Health Professions 1 2%
Other 1 2%
Unknown 17 37%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 19 January 2018.
All research outputs
#20,459,801
of 23,016,919 outputs
Outputs from Rice
#306
of 388 outputs
Outputs of similar age
#378,732
of 441,888 outputs
Outputs of similar age from Rice
#7
of 8 outputs
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So far Altmetric has tracked 388 research outputs from this source. They receive a mean Attention Score of 3.8. This one is in the 1st percentile – i.e., 1% of its peers scored the same or lower than it.
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