不同播期下小麦品种百农207越冬期生理生化特性

Physiological and Biochemical Characteristics of New Wheat Cultivar Bainong 207 in the Overwintering Period Under Different Sowing Date

为了研究播期对小麦品种百农207越冬期生理生化特性的影响,以周麦18为对照,于2016—2017年10月08日、10月15日、10月22日、10月29日和11月05日在大田条件下进行不同播期试验,并测定小麦越冬期根系活力及叶片叶绿素、脯氨酸(Pro)、可溶性蛋白(Pr)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)等生理生化指标。结果表明,在大田自然低温条件下,随播期推迟,2个小麦品种越冬期各生理生化指标变化趋势不尽一致。与周麦18相比,5个播期中,百农207除11月05日播期的Pro含量显著降低(P <0.05)外,其他播期的根系活力、叶绿素含量、Pro含量、Pr含量、SOD活性和POD活性均有提高,MDA含量显著降低(P <0.05)。由此可见,百农207越冬期耐寒性强于周麦18,其中以10月08日至10月15日可作为百农207的适宜播期播种,周麦18应适当晚播。

The study aimed to discuss the effect of sowing date on physiological and biochemical characteristics of new wheat cultivar Bainong 207 in the overwintering period. The experiment was conducted on five sowing dates including October 1, October 8, October 15, October 22, October 29 and November 5, the interrelated physiological biochemical index in cold tolerance during overwintering period during 2016—2017 was determined, such as root activity, chlorophyll content,proline(Pro) content, soluble protein(Pr) content, malondialdehyde(MDA) content, SOD activity and POD activity, taking Zhoumai 18 as the control variety. The results showed that, under the natural conditions in the field, the changing trends of the different physiological biochemical index on two wheat cultivars weren’t consistent during the overwintering period.Compared with Zhoumai 18, except the Pro content in November 5 was significantly reduced(P < 0.05), root activity, chlorophyll content, Pro content, Pr content, SOD activity and POD activity on Bainong 207 were increased, and MDA content was reduced significantly(P < 0.05). Therefore, Bainong 207 was more tolerant to low temperature than Zhoumai 18 during overwintering period, the cold tolerance in October 8 and October 15 were better than other sowing date, which were the appropriate sowing date for new wheat variety Bainong 207, Zhoumai 18 should be sowed relatively later.