Wu Xue-Jun, Sun Sheng, Xing Guo-Ming, Wang Guang-Long, Wang Feng, Xu Zhi-Sheng, Tian Yong-Sheng, Hou Xi-Lin, Xiong Ai-Sheng
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University Nanjing, China.
College of Horticulture, Shanxi Agricultural University Taigu, China.
Front Plant Sci. 2017 Jan 5;7:2026. doi: 10.3389/fpls.2016.02026. eCollection 2016.
The CO concentration in the atmosphere has increased significantly in recent decades and is projected to rise in the future. The effects of elevated CO concentrations on morphological and anatomical characteristics, and nutrient accumulation have been determined in several plant species. Carrot is an important vegetable and the effects of elevated CO on carrots remain unclear. To investigate the effects of elevated CO on the growth of carrots, two carrot cultivars ('Kurodagosun' and 'Deep purple') were treated with ambient CO (a[CO], 400 μmol⋅mol) and elevated CO (e[CO], 3000 μmol⋅mol) concentrations. Under e[CO] conditions, taproot and shoot fresh weights and the root/shoot ratio of carrot significantly decreased as compared with the control group. Elevated CO resulted in obvious changes in anatomy and ascorbic acid accumulation in carrot roots. Moreover, the transcript profiles of 12 genes related to AsA biosynthesis and recycling were altered in response to e[CO]. The 'Kurodagosun' and 'Deep purple' carrots differed in sensitivity to e[CO]. The inhibited carrot taproot and shoot growth treated with e[CO] could partly lead to changes in xylem development. This study provided novel insights into the effects of e[CO] on the growth and development of carrots.
近几十年来，大气中的一氧化碳（CO）浓度显著增加，预计未来还会上升。已在几种植物物种中确定了升高的CO浓度对形态和解剖特征以及养分积累的影响。胡萝卜是一种重要的蔬菜，CO升高对胡萝卜的影响尚不清楚。为了研究升高的CO对胡萝卜生长的影响，用环境CO（a[CO]，400 μmol·mol）和升高的CO（e[CO]，3000 μmol·mol）浓度处理了两个胡萝卜品种（‘黑田五寸’和‘深紫色’）。在e[CO]条件下，与对照组相比，胡萝卜的主根和地上部鲜重以及根冠比显著降低。CO升高导致胡萝卜根的解剖结构和抗坏血酸积累发生明显变化。此外，响应e[CO]，与抗坏血酸生物合成和循环相关的12个基因的转录谱发生了改变。‘黑田五寸’和‘深紫色’胡萝卜对e[CO]的敏感性不同。用e[CO]处理抑制的胡萝卜主根和地上部生长可能部分导致木质部发育的变化。本研究为e[CO]对胡萝卜生长发育的影响提供了新的见解。
