Water and nitrogen conditions affect the relationships of Delta13C and Delta18O to gas exchange and growth in durum wheat.
Water and nitrogen conditions affect the relationships of Delta13C and Delta18O to gas exchange and growth in durum wheat.
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DOI：
10.1093/jxb/erp028
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发表时间：
2009
影响因子：
6.9
通讯作者：
Araus JL
中科院分区：
文献类型：
--
作者：
Cabrera-Bosquet L;Molero G;Nogués S;Araus JL
尽管水和氮（N）对植物Δ 13 C的影响以前已有报道，但这些因素对Δ 18 O的影响几乎没有研究。研究了不同水氮管理对4种硬粒小麦（Triticum turgidum L.）SSP. durum（Desf.）Husn.]进行了盆栽试验。水和氮的供应显着增加植物生长。然而，供水量的减少并没有导致气体交换参数的显著降低，因此Δ 13 C仅被水输入略微改变。相反，氮肥显著降低了Δ 13 C。另一方面，供水降低了Δ18O值，而N不影响该参数。Δ 18 O的变化主要取决于植物生长过程中的蒸腾水量（Tcum），而Δ 13 C的变化部分取决于叶片N和气孔导度（gs）的组合。尽管4种基因型在累积蒸腾速率和生物量上表现出显著差异，但这并不转化为Δ18Os的显著差异。然而，观察到Δ 13 C的基因型差异。此外，生长条件和基因型之间生物量变化的约80%可以通过两种同位素的组合来解释，其中Δ 18 O单独占约50%。这说明了结合Δ 18 O和Δ 13 C的有用性，以评估植物生长和总蒸腾的差异，并提供作物生长过程中植物光合和蒸发性能的时间积分记录。
Whereas the effects of water and nitrogen (N) on plant Δ13C have been reported previously, these factors have scarcely been studied for Δ18O. Here the combined effect of different water and N regimes on Δ13C, Δ18O, gas exchange, water-use efficiency (WUE), and growth of four genotypes of durum wheat [Triticum turgidum L. ssp. durum (Desf.) Husn.] cultured in pots was studied. Water and N supply significantly increased plant growth. However, a reduction in water supply did not lead to a significant decrease in gas exchange parameters, and consequently Δ13C was only slightly modified by water input. Conversely, N fertilizer significantly decreased Δ13C. On the other hand, water supply decreased Δ18O values, whereas N did not affect this parameter. Δ18O variation was mainly determined by the amount of transpired water throughout plant growth (Tcum), whereas Δ13C variation was explained in part by a combination of leaf N and stomatal conductance (gs). Even though the four genotypes showed significant differences in cumulative transpiration rates and biomass, this was not translated into significant differences in Δ18Os. However, genotypic differences in Δ13C were observed. Moreover, ∼80% of the variation in biomass across growing conditions and genotypes was explained by a combination of both isotopes, with Δ18O alone accounting for ∼50%. This illustrates the usefulness of combining Δ18O and Δ13C in order to assess differences in plant growth and total transpiration, and also to provide a time-integrated record of the photosynthetic and evaporative performance of the plant during the course of crop growth.
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影响因子：
7.4
作者：
Barbour, MM;Schurr, U;Farquhar, GD
通讯作者：
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影响因子：
3.7
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影响因子：
2.6
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影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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