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Alternate row mulching optimizes soil temperature and water conditions and improves wheat yield in dryland farming
YAN Qiu-yan, DONG Fei, LOU Ge, YANG Feng, LU Jin-xiu, LI Feng, ZHANG Jian-cheng, LI Jun-hui, DUAN Zeng-qiang
2018, 17 (11): 2558-2569.   DOI: 10.1016/S2095-3119(18)61986-0
Abstract339)      PDF (1844KB)(252)      
Straw mulching allows for effective water storage in dryland wheat production.  Finding a suitable straw mulching model that facilitates wheat growth was the objective of this study.  A 2-year field experiment was conducted to investigate the effects of two straw mulching patterns (FM, full coverage within all the rows; HM, half coverage within alternate rows) and two mulching rates (4.5 and 9.0 t ha–1) on soil moisture, soil temperature, grain yield, and water use efficiency (WUE) of winter wheat in northern China, with no mulching (M0) as the control.  Results showed that mulching increased the soil water storage in all growth stages under high mulching rates, with a stronger effect in later growth stages.  Water storage under the HM model was greater in later stages than under the FM model.  Soil water content of HM groups was higher than that of FM groups, especially in surface soil layers.  Evapotranspiration decreased in mulched groups and was higher under high mulching rates.  Aboveground biomass during each growth stage under the HM model was higher than that under M0 and FM models with the same mulched rate, leading to a relatively higher grain yield under the HM model.  Mulching increased WUE, a trend that was more obvious under HM9.0 treatment.  Warming effect of soil temperature under the HM pattern persisted longer than under the FM model with the same mulching rates.  Accumulated soil temperature under mulched treatments increased, and the period of negative soil temperature decreased by 9–12 days under FM and by 10–20 days under HM.  Thus, the HM pattern with 9.0 t ha–1 mulching rate is beneficial for both soil temperature and water content management and can contribute to high yields and high WUE for wheat production in China. 
 
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Characterization of a Novel Chlorophyll-Deficient Mutant Mt6172 in Wheat
GUO Hui-jun, ZHAO Hong-bing, GU Jia-yu, LI Jun-hui, LIU Qingchang, LIU Lu-xiang
2012, 12 (6): 888-897.   DOI: 10.1016/S1671-2927(00)8611
Abstract1773)      PDF in ScienceDirect      
Identification of new chlorophyll-deficient mutants will provide materials for studying signaling components and pathways between plastid and nucleus. A novel chlorophyll-deficient mutant, named Mt6172, was obtained by spaceflight environment induction. Genetic analysis showed that its inheritance was controlled by nuclear and cytoplamic genes. Leaf color of its self-fertilized progenies was albino, narrow-white striped, or green. Only a few cells with abnormal chloroplasts were observed in albino plants and white section of narrow-white striped plants. These chloroplasts had obvious flaws in inner structure, and granum lamellae was extremely disordered. The narrow-white striped plants were characterized with greenand- narrow-white striped leaves, and the width of stripes between different plants was even, their plant height, number of productive tillers, and 1 000-grain weight were lower than those of the wild type. The narrow-white striped plants and the wild type had significant difference in the value of potential activity of photosystem II at all tested stages. At elongation stage, which was impacted the most seriously, effective quantum yield significantly decreased, whereas the energy for photoprotection and photodamage significantly increased. Under different photosynthetic active radiation conditions, changes of electron transport rate, photochemical dissipation, and effective quantum yield were different, electron transport rate was more impacted than other parameters. Therefore, the leaf morphology and inheritance of mutant Mt6172 was different from the other reported mutants in wheat, and it was a novel mutant of chlorophyll deficiency.
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