Zhang Chao, Zhang Da-Wei, Sun Yan-Ni, Arfan Muhammad, Li Da-Xu, Yan Jia-Jun, You Ming-Hong, Bai Shi-Qie, Lin Hong-Hui
Ministry of Education Key Laboratory for Bio-Resource and Eco-Environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610064, China.
Sichuan Academy of Grassland Science, Chengdu, Sichuan 611731, China.
J Plant Physiol. 2017 Aug;215:11-19. doi: 10.1016/j.jplph.2017.04.017. Epub 2017 May 4.
Due to its characteristic of high biomass yield potential, there is considerable interest in cultivating Phalaris arundinacea L. cv. 'chuancaoyin No.3' (reed canary grass) on the Qinghai-Tibet Plateau where there is an abundance of alpine steppe meadow and a potential large market for animal husbandry. In this study, we 1) investigate whether reed canary grass exhibits superior productive capacity to Elymus nutans 'Aba' (E. nutans), ordinary common pasture, during the long warm days of summer at high-altitude; and 2) compare the cold tolerance between reed canary grass and E. nutans, including photosynthesis, photo-inhibition, and photo-protection. The results suggest that reed canary grass exhibits higher photosynthetic capacity compared to E. nutans at latitudes of the cool temperate zone. Meanwhile, cold-induced photo-inhibition and photo-damage at high altitudes in reed canary grass were due to both stomatal and non-stomatal limitation, and the enhancement in photo-respiration, thermal dissipation, and Mehler reaction are important processes to minimize the negative effects of high elevation and a cold environment.
由于其具有高生物量产量潜力的特性，人们对在青藏高原种植‘川草引3号’虉草（披碱草）有着浓厚兴趣，该地区有丰富的高寒草原草甸，且畜牧业潜在市场巨大。在本研究中，我们：1）调查在高海拔地区夏季漫长温暖的日子里，虉草的生产能力是否优于垂穗披碱草‘阿坝’（垂穗披碱草）、普通常见牧场；2）比较虉草和垂穗披碱草的耐寒性，包括光合作用、光抑制和光保护。结果表明，在寒温带纬度地区，虉草的光合能力高于垂穗披碱草。同时，虉草在高海拔地区由低温诱导的光抑制和光损伤是由气孔和非气孔限制共同导致的，而光呼吸、热耗散和梅勒反应的增强是将高海拔和寒冷环境的负面影响降至最低的重要过程。
