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Differences in Sugar Accumulation and Mobilization between Sequential and Non-Sequential Senescence Wheat Cultivars under Natural and Drought Conditions.
PLoS One 2016; 11(11):e0166155Plos

Abstract

Wheat leaf non-sequential senescence at the late grain-filling stage involves the early senescence of younger flag leaves compared to that observed in older second leaves. On the other hand, sequential senescence involves leaf senescence that follows an age-related pattern, in which flag leaves are the latest to undergo senescence. The characteristics of sugar metabolism in two sequential senescence cultivars and two non-sequential senescence cultivars under both natural and drought conditions were studied to elucidate the underlying mechanism of drought tolerance in two different senescence modes. The results showed that compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate, higher soluble sugar levels in leaves, leaf sheaths, and internodes, higher leaf sucrose synthase (SS) and sucrose phosphate synthase (SPS) activity, and higher grain SS activity, thereby suggesting that non-sequential senescence wheat cultivars had stronger source activity. Spike weight, grain weight per spike, and 100-grain weight of non-sequential senescence cultivars at maturity were significantly higher than those of sequential senescence cultivars under both natural and drought conditions. These findings indicate that the higher rate of accumulation and the higher mobilization of soluble sugar in the leaves, leaf sheaths and internodes of non-sequential senescence cultivars improve grain weight and drought tolerance. At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight. This study showed that higher rates of soluble sugar accumulation in the source was one of the reasons of triggering leaf non-sequential senescence, and higher rates of soluble sugar mobilization during leaf non-sequential senescence promoted high and stable wheat yield and drought tolerance.

Authors+Show Affiliations

College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27814393

Citation

Shi, Huarong, et al. "Differences in Sugar Accumulation and Mobilization Between Sequential and Non-Sequential Senescence Wheat Cultivars Under Natural and Drought Conditions." PloS One, vol. 11, no. 11, 2016, pp. e0166155.
Shi H, Wang B, Yang P, et al. Differences in Sugar Accumulation and Mobilization between Sequential and Non-Sequential Senescence Wheat Cultivars under Natural and Drought Conditions. PLoS ONE. 2016;11(11):e0166155.
Shi, H., Wang, B., Yang, P., Li, Y., & Miao, F. (2016). Differences in Sugar Accumulation and Mobilization between Sequential and Non-Sequential Senescence Wheat Cultivars under Natural and Drought Conditions. PloS One, 11(11), pp. e0166155. doi:10.1371/journal.pone.0166155.
Shi H, et al. Differences in Sugar Accumulation and Mobilization Between Sequential and Non-Sequential Senescence Wheat Cultivars Under Natural and Drought Conditions. PLoS ONE. 2016;11(11):e0166155. PubMed PMID: 27814393.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differences in Sugar Accumulation and Mobilization between Sequential and Non-Sequential Senescence Wheat Cultivars under Natural and Drought Conditions. AU - Shi,Huarong, AU - Wang,Bin, AU - Yang,Piaojuan, AU - Li,Yibo, AU - Miao,Fang, Y1 - 2016/11/04/ PY - 2016/05/03/received PY - 2016/10/23/accepted PY - 2016/11/5/entrez PY - 2016/11/5/pubmed PY - 2017/6/27/medline SP - e0166155 EP - e0166155 JF - PloS one JO - PLoS ONE VL - 11 IS - 11 N2 - Wheat leaf non-sequential senescence at the late grain-filling stage involves the early senescence of younger flag leaves compared to that observed in older second leaves. On the other hand, sequential senescence involves leaf senescence that follows an age-related pattern, in which flag leaves are the latest to undergo senescence. The characteristics of sugar metabolism in two sequential senescence cultivars and two non-sequential senescence cultivars under both natural and drought conditions were studied to elucidate the underlying mechanism of drought tolerance in two different senescence modes. The results showed that compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate, higher soluble sugar levels in leaves, leaf sheaths, and internodes, higher leaf sucrose synthase (SS) and sucrose phosphate synthase (SPS) activity, and higher grain SS activity, thereby suggesting that non-sequential senescence wheat cultivars had stronger source activity. Spike weight, grain weight per spike, and 100-grain weight of non-sequential senescence cultivars at maturity were significantly higher than those of sequential senescence cultivars under both natural and drought conditions. These findings indicate that the higher rate of accumulation and the higher mobilization of soluble sugar in the leaves, leaf sheaths and internodes of non-sequential senescence cultivars improve grain weight and drought tolerance. At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight. This study showed that higher rates of soluble sugar accumulation in the source was one of the reasons of triggering leaf non-sequential senescence, and higher rates of soluble sugar mobilization during leaf non-sequential senescence promoted high and stable wheat yield and drought tolerance. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/27814393/Differences_in_Sugar_Accumulation_and_Mobilization_between_Sequential_and_Non_Sequential_Senescence_Wheat_Cultivars_under_Natural_and_Drought_Conditions_ L2 - http://dx.plos.org/10.1371/journal.pone.0166155 DB - PRIME DP - Unbound Medicine ER -