Temporal separation between CO2 assimilation and growth? Experimental and theoretical evidence from the desiccation-tolerant moss Syntrichia ruralis.
Temporal separation between CO2 assimilation and growth? Experimental and theoretical evidence from the desiccation-tolerant moss Syntrichia ruralis.
复制标题
二氧化碳同化和生长之间的时间间隔？
DOI：
10.1111/nph.12114
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Royles J
中科院分区：
文献类型：
--
作者：
Royles J
苔藓组织周围外部水层的范围影响co2同化。对耐干燥苔藓（syntrichia rural）的实验评估了苔藓水分状态和纤维素中综合同位素信号对co2和H2O碳氧同位素组成的实时依赖。分析了苔藓组织外源（毛细）水分和叶肉水分的同化速率、相对含水量和组织水稳定同位素组成（δ18OTW）以及co2和H2O通量。干燥后测定纤维素的碳（δ13CC）和氧（δ18OC）组成。在干化过程中，同化和13co2辨别先增大后减小；δ 18otw8‰逐渐增大，表明蒸发同位素富集。实验和气象数据相结合，预测组织水化动力学在一个生长季节。δ 18otw2的非稳态模型预测与瞬时测量结果一致。δ 13cc值表明净同化发生在最大相对含水量的25%，而δ 18occ数据表明纤维素在更高的相对含水量条件下合成。这意味着碳同化和纤维素合成（生长）可能暂时分离，碳储备可能有助于脱水耐受性和恢复脱水后的代谢。
The extent of an external water layer around moss tissue influences CO2assimilation. Experiments on the desiccation‐tolerant mossSyntrichia ruralisassessed the real‐time dependence of the carbon and oxygen isotopic compositions of CO2and H2O in terms of moss water status and integrated isotope signals in cellulose.As external (capillary) water, and then mesophyll water, evaporated from moss tissue, assimilation rate, relative water content and the stable isotope composition of tissue water (δ18OTW), and the CO2and H2O fluxes, were analysed. After drying, carbon (δ13CC) and oxygen (δ18OC) cellulose compositions were determined.During desiccation, assimilation and13CO2discrimination increased to a maximum and then declined; δ18OTWincreased progressively by 8‰, indicative of evaporative isotopic enrichment. Experimental and meteorological data were combined to predict tissue hydration dynamics over one growing season. Nonsteady‐state model predictions of δ18OTWwere consistent with instantaneous measurements.δ13CCvalues suggest that net assimilation occurs at 25% of maximum relative water content, while δ18OCdata suggests that cellulose is synthesized during much higher relative water content conditions. This implies that carbon assimilation and cellulose synthesis (growth) may be temporally separated, with carbon reserves possibly contributing to desiccation tolerance and resumption of metabolism upon rehydration.
登录
查看更多内容
光合作用反应
影响因子：
2.3
作者：
E. Pinkard;C. Beadle;N. Davidson;M. Battaglia
通讯作者：
M. Battaglia
含水量对阿拉斯加菲利普·史密斯山脉山麓泥炭藓光合反应的影响
影响因子：
2.7
作者：
Kevin Murray;Peter Harley;J. Beyers;H. Walz;John D. Tenhunen
通讯作者：
John D. Tenhunen
不同含水量和CO2浓度对黑檀光合作用的综合影响
DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
J. Silvola
通讯作者：
J. Silvola
影响因子：
7.3
作者：
Rice, SK;Giles, L
通讯作者：
Giles, L
影响因子：
4.4
作者：
Yoshimura, K.;Kanamitsu, M.;Oki, T.
通讯作者：
Oki, T.