Journal Title
Title of Journal: Ann Bot
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Abbravation: Annals of Botany
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Authors: Kuang Anxiu Xiao Ying McClure Gloria Musgrave Mary E
Publish Date: 2000/06/01
Volume: 85, Issue: 6, Pages: 851-859
Abstract
Anxiu Kuang Ying Xiao Gloria McClure Mary E Musgrave Influence of Microgravity on Ultrastructure and Storage Reserves in Seeds of Brassica rapa L Annals of Botany Volume 85 Issue 6 June 2000 Pages 851–859 https//doiorg/101006/anbo20001153Successful plant reproduction under spaceflight conditions has been problematic in the past During a 122 d opportunity on the Mir space station full life cycles of Brassica rapa L were completed in microgravity in a series of three experiments in the Svet greenhouse Ultrastructural and cytochemical analyses of storage reserves in mature dry seeds produced in these experiments were compared with those of seeds produced during a highfidelity ground control Additional analyses were performed on developing Brassica embryos 15 d post pollination which were produced during a separate experiment on the Shuttle STS87 Seeds produced on Mir had less than 20 of the cotyledon cell number found in seeds harvested from the ground control Cytochemical localization of storage reserves in mature cotyledons showed that starch was retained in the spaceflight material whereas protein and lipid were the primary storage reserves in ground control seeds Protein bodies in mature cotyledons produced in space were 44 smaller than those in the ground control seeds Fifteen days after pollination cotyledon cells from mature embryos formed in space had large numbers of starch grains and protein bodies were absent while in developing ground control seeds at the same stage protein bodies had already formed and fewer starch grains were evident These data suggest that both the late stage of seed development and maturation are changed in Brassica by growth in a microgravity environment While gravity is not absolutely required for any step in the plant life cycle seed quality in Brassica is compromised by development in microgravity Copyright 2000 Annals of Botany Company
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