Abstract：
:In young cucumber seedlings, the peg is a polar out-growth of tissue that functions by snagging the seed coat, thereby freeing the cotyledons. Previous studies have indicated that peg formation is gravity dependent. In this study we analyzed peg formation in cucumber seedlings (Cucumis sativus L. cv Burpee Hybrid II) grown under conditions of normal gravity, microgravity, and simulated microgravity (clinostat rotation). Seeds were germinated on the ground, in clinostats and on board the space shuttle (STS 95) for 1-2 days, frozen and subsequently examined for their stage of development, degree of hook formation, number of pegs formed, and peg morphology. The frequency of peg formation in space grown seedlings was found to be nearly identical to that of clinostat grown seedlings and to differ from that of seedlings germinated under normal gravity only in a minority of cases; approximately 6% of the seedlings formed two pegs and nearly 2% of the seedlings lacked pegs, whereas such abnormalities did not occur in ground controls. The degree of hook formation was found to be less pronounced for space grown seedlings, compared to clinostat grown seedlings, indicating a greater degree of decoupling between peg formation and hook formation in space. Nonetheless, in all seedlings having single pegs and a hook, the peg was found to be positioned correctly on the inside of the hook, showing that there is coordinate development even in microgravity environments. Peg morphologies were altered in space grown samples, with the pegs having a blunt appearance and many pegs showing alterations in expansion, with the peg extending out over the edges of the seed coat and downwards. These phenotypes were not observed in clinostat or ground grown seedlings.
journal_name
J Plant Resjournal_title
Journal of plant researchauthors
Link BM,Cosgrove DJdoi
10.1007/pl00013907subject
Has Abstractpub_date
1999-12-01 00:00:00pages
507-16issue
1108eissn
0918-9440issn
1618-0860journal_volume
112pub_type
杂志文章abstract：:A new species Camellia nanningensis was described on the basis of well-preserved mummified wood from the upper Oligocene Yongning Formation of Nanning Basin in Guangxi Province, South China. This represents the most ancient fossil wood assigned to Camellia, and the earliest fossil record of the family Theaceae in Chin...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0846-8
更新日期：2016-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-015-0735-6
更新日期：2015-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-009-0279-8
更新日期：2010-05-01 00:00:00
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pub_type： 杂志文章
doi：10.1007/s10265-002-0062-6
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pub_type： 杂志文章
doi：10.1007/s10265-013-0578-y
更新日期：2014-01-01 00:00:00
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更新日期：2015-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/BF02344552
更新日期：1996-12-01 00:00:00
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更新日期：2017-03-01 00:00:00
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pub_type： 杂志文章
doi：10.1007/s10265-004-0155-5
更新日期：2004-08-01 00:00:00
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pub_type： 杂志文章
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更新日期：2016-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-010-0320-y
更新日期：2010-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-009-0251-7
更新日期：2009-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-015-0726-7
更新日期：2015-07-01 00:00:00
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pub_type： 杂志文章
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更新日期：2019-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章,评审
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更新日期：2015-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-007-0078-z
更新日期：2007-05-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-006-0070-z
更新日期：2007-05-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2009-01-01 00:00:00
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journal_title：Journal of plant research
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-008-0188-2
更新日期：2009-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2012-07-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-019-01152-4
更新日期：2020-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-010-0346-1
更新日期：2011-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s102650200012
更新日期：2002-04-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2003-08-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-019-01122-w
更新日期：2019-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-014-0632-4
更新日期：2014-05-01 00:00:00
abstract：:Structures and levels of anthocyanin-related compounds were analyzed during the development of marginal picotee petals in white-center and white-marginal cultivars of Petunia hybrida. In the white site of a white-center cultivar, higher concentrations of quercetin derivatives possessing 7-O-glucoside and/or 3'-O-gluco...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-007-0086-z
更新日期：2007-07-01 00:00:00
