Abstract：
BACKGROUND:It is known that hexaploid common wheat (Triticum aestivum L.) has stronger adaptability to many stressful environments than its tetraploid wheat progenitor. However, the physiological basis and evolutionary course to acquire these enhanced adaptabilities by common wheat remain understudied. Here, we aimed to investigate whether and by what means tolerance to low-nitrogen manifested by common wheat may emerge immediately following allohexaploidization. RESULTS:We compared traits related to nitrogen (N) metabolism in a synthetic allohexaploid wheat (neo-6×, BBAADD) mimicking natural common wheat, together with its tetraploid (BBAA, 4×) and diploid (DD, 2×) parents. We found that, under low nitrogen condition, neo-6× maintained largely normal photosynthesis, higher shoot N accumulation, and better N assimilation than its 4× and 2× parents. We showed that multiple mechanisms underlie the enhanced tolerance to N-deficiency in neo-6×. At morphological level, neo-6× has higher root/shoot ratio of biomass than its parents, which might be an adaptive growth strategy as more roots feed less shoots with N, thereby enabling higher N accumulation in the shoots. At electrophysiological level, H+ efflux in neo-6× is higher than in its 4× parent. A stronger H+ efflux may enable a higher N uptake capacity of neo-6×. At gene expression level, neo-6× displayed markedly higher expression levels of critical genes involved in N uptake than both of its 4× and 2× parents. CONCLUSIONS:This study documents that allohexaploid wheat can attain immediate higher tolerance to N-deficiency compared with both of its 4× and 2× parents, and which was accomplished via multiple mechanisms.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Yang C,Yang Z,Zhao L,Sun F,Liu Bdoi
10.1186/s12870-018-1334-1subject
Has Abstractpub_date
2018-06-07 00:00:00pages
113issue
1issn
1471-2229pii
10.1186/s12870-018-1334-1journal_volume
18pub_type
杂志文章abstract：BACKGROUND:Plant biologists have long speculated about the mechanisms that guide pollen tubes to ovules. Although there is now evidence that ovules emit a diffusible attractant, little is known about how this attractant mediates interactions between the pollen tube and the ovules. RESULTS:We employ a semi-in vitro ass...
journal_title：BMC plant biology
pub_type： 杂志文章
doi：10.1186/1471-2229-10-32
更新日期：2010-02-22 00:00:00
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doi：10.1186/1471-2229-7-31
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更新日期：2020-01-09 00:00:00
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更新日期：2018-10-11 00:00:00
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pub_type： 杂志文章,meta分析
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更新日期：2014-04-02 00:00:00
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doi：10.1186/1471-2229-11-51
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更新日期：2014-05-05 00:00:00
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更新日期：2010-04-29 00:00:00
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更新日期：2016-01-28 00:00:00
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更新日期：2016-08-26 00:00:00
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