Nitrogen supplementation improves the high-light acclimation of Guazuma ulmifolia Lam. seedlings
Nitrogen supplementation improves the high-light acclimation of Guazuma ulmifolia Lam. seedlings
复制标题
氮素补充改善了 Guazuma ulmifolia Lam 的强光适应能力。
DOI：
10.1007/s00468-018-1788-7
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
H. Oliveira
中科院分区：
文献类型：
--
作者：
Juliana Silva Rocha;A. Calzavara;E. Bianchini;J. Pimenta;R. Stolf;H. Oliveira
关键信息在苗圃的强光驯化过程中，高氮素供应防止了瓜子幼苗的动态光抑制，提高了其形态生理质量。摘要全日照驯化是苗圃生产中的一个重要步骤，因为它提高了植物对胁迫条件的抗性。因此，改善高光驯化的管理技术的发展可以促进更高质量的苗木的生产。鉴于氮(N)对植物生长和光合作用代谢的重要性，我们在这里评估了高氮水平(HN)的补充是否能积极地影响新热带地区广泛应用的树种Guazuma ulmifolia Lam.的强光驯化。我们比较了从苗圃的遮荫部分转移到全光照下的苗木在添加或不添加HN的情况下的形态生理参数。HN的供应阻止了中午对光系统II(PSII)活性和CO2同化速率的抑制，这表明HN避免了动态光抑制。这一效应与HN诱导的PSII电子传递速率、羧化效率和叶片对CO2的电导增加有关，而与气孔限制的降低无关。CO2同化的光饱和点和PSII电子传递速率的增加表明，高能氮同化导致PSII的过剩激发能减少，这可能也有助于N的保护作用。此外，HN处理增加了幼苗的生物量积累和茎基径，提高了驯化幼苗的Dickson质量指数。总体而言，这些结果表明，苗圃在强光驯化期间供应HN改善了G的形态生理品质。最后一棵树的树苗。
Key messageHigh nitrogen supply prevents dynamic photoinhibition inGuazuma ulmifoliaseedlings and improves their morphophysiological quality during the high-light acclimation in the nursery.AbstractAcclimation under full sun is an important step in the production of tree seedlings in nurseries because it increases plant resistance to stressful conditions. Thus, the development of management techniques that improve high-light acclimation could facilitate the production of higher-quality seedlings. Given the importance of nitrogen (N) for plant growth and photosynthetic metabolism, here we evaluated whether supplementation with high N levels (HN) could positively affect the high-light acclimation of seedlings ofGuazuma ulmifoliaLam., a tree species widely used in reforestation programs in the neotropics. We compared the morphophysiological parameters of seedlings transferred from the shaded sector of the nursery to full sun that were supplemented with or without HN. HN supply prevented the midday depression of both photosystem II (PSII) activity and the CO2assimilation rate, suggesting the avoidance of dynamic photoinhibition by HN. This effect was related to HN-induced increases in the electron transport rate of PSII, carboxylation efficiency and mesophyll conductance to CO2and not to reduced stomatal limitation. A decrease in excess excitation energy in PSII resulting from energy-demanding N assimilation, as suggested by increases in the light saturation points of the CO2assimilation and PSII electron transport rates, might also contribute to the protective effect of N. In addition, HN treatment increased seedling biomass accumulation and stem base diameter, enhancing the Dickson quality index of the acclimated seedlings. Overall, these results indicate that HN supply during high-light acclimation in the nursery improves the morphophysiological quality ofG. ulmifoliaseedlings.
影响因子：
3.7
作者：
I. Terashima
通讯作者：
I. Terashima
清除落叶松冠层和氮供应对落叶阔叶树幼苗气体交换和叶片性状的影响。
DOI：
--
发表时间：
2009
期刊：
Tree Physiology 29
影响因子：
--
作者：
Kitaoka;S.;Watanabe;Y.;Koike;T.
通讯作者：
T.