数字农科院2.0

The physiological and proteomic characteristics of oilseed rape stem affect seed yield and lodging resistance under different planting densities and row spacing

文献类型： 外文期刊

作者： Jie Kuai;Xiaoyong Li;Jianli Ji;Zhen Li;Yan Xie;Bo Wang;Guangsheng Zhou

作者机构：

关键词： density;lodging;row spacing;stem;yield

期刊名称： Journal of Agronomy and Crop Science

ISSN： 0931-2250

年卷期： 2021 年 207.0 卷 5.0 期

页码：

收录情况： JCR（2021版）

摘要： Lodging is an important factor that restricts the yield of rapeseed and the mechanical harvesting. To explore agricultural practise and mechanisms that can synergistically improve the rapeseed yield and lodging resistance, a conventional plant type HZ 62 was selected in 2016–2017, and HZ 62 and an erect-leaf type 1,301 were grown in 2017–2018. The planting density was set as main plots at 15 × 104 plants ha1 (D1), 30 × 104 plants ha-1 (D2) and 45 × 104 plants ha−1 (D3), with the row spacing as sub-plots of 15 cm (R15), 25 cm (R25) and 35 cm (R35). The results showed that with increased density and narrowed row spacing, the radiation utilisation efficiency (RUE) of the population and seed yield were greatly increased. Compared with that at D1R25, the yield of HZ 62 at D3R15 was increased by 19.00% and 22.53%, respectively, in 2016–2017 and 2017–2018, whereas the yield of 1,301 rose by 31.98%. The influence of the RUE on the seed yield reached the peak at flowering stage. With increased planting density and narrowed row spacing, the lodging index of HZ 62 declined. The lodging index of 1,301 was increased with higher density and declined with narrowed row spacing. Compared with D1R25, the averaged lodging index across different parts of HZ 62 at D3R15 declined by 15.03% and 10.80%, respectively, in 2016–2017 and 2017–2018, and that of 1,301 was increased by 25.47%. Compared with D1R25, the stem proteomics during the flowering stage showed the expression of photosynthesis-related proteins (A0A078FHG9, A0A078JZM9 and A0A078JQI2) up-regulated, that consistent with Rubisco, SPS and FBPase activities; proteins related to phenylpropanes metabolism, A0A078IWR4 of HZ 62 and A0A078JWZ9 of 1,301 increased that consistent with POD activity, which resulted in more sucrose, starch and lignin in the stem at D3R15. Moreover, the protein related to cellulose synthesis (A0A078I4D9), the activity of β-1,3-glucanase and content of cellulose in the stem were up-regulated in HZ 62 but down-regulated in 1,301, contrary to the variation in the stem lodging index. The cellulose synthesis differed between the varieties in different treatment combinations of planting density and row spacing. This was the key process by which planting density and row spacing influence the lodging of rapeseed varieties with varied plant architecture.

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