Center of Seed Science and Technology, Beijing Key Laboratory of Crop Genetics and Breeding, Beijing Innovation Center for Seed Technology (MOA), College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
Institute of Grain Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, China.
Sci Rep. 2017 Dec 13;7(1):17537. doi: 10.1038/s41598-017-16071-4.
To identify the ideal harvest time (IHT) for the seed production of XY335 and ZD958, six seed-related traits were evaluated in seeds harvested at 11 harvest stages in 8 environments. Standard germination (SG), accelerated aging germination (AAG) and cold test germination (CTG) were vigor traits; hundred-seed weight (HSW) and seed moisture content (SMC) were physiological traits; and ≥10 °C accumulated temperature from pollination to harvest (AT10) was an ecological trait. All the traits were significantly affected by harvest stage. The responses of SG, AAG, CTG and HSW to postponing harvest stage fit quadratic models, while SMC and AT10 fit linear models. The IHT (indicated by the last date to reach maximum SG, AAG and CTG) were 57.97 DAP and 56.80 DAP for XY335 and ZD958, respectively. SMC and AT10 at IHT were 33.15% and 1234 °C for XY335, and 34.98% and 1226 °C for ZD958, respectively. The period to reach the maximum HSW was 5 days later than the IHT. Compared to HSW and SMC, AT10 had a closer relationship to the seed vigor traits. Together with the fact that AT10 was less affected by environment, these results suggested that AT10 may be a novel indicator for determining the IHT.
为了确定 XY335 和 ZD958 种子生产的理想收获期 (IHT)，在 8 个环境中，在 11 个收获阶段收获的种子中评估了 6 个与种子相关的特性。标准发芽 (SG)、加速老化发芽 (AAG) 和冷试验发芽 (CTG) 是活力特性；百粒重 (HSW) 和种子水分含量 (SMC) 是生理特性；授粉至收获的 ≥10°C 积温 (AT10) 是生态特性。所有特性均受收获阶段的显著影响。SG、AAG、CTG 和 HSW 的响应推迟收获阶段适合二次模型，而 SMC 和 AT10 适合线性模型。IHT（以达到最大 SG、AAG 和 CTG 的最后日期表示）分别为 XY335 的 57.97 DAP 和 ZD958 的 56.80 DAP。在 IHT 时 SMC 和 AT10 分别为 XY335 的 33.15%和 1234°C，ZD958 的 34.98%和 1226°C。达到最大 HSW 的时间比 IHT 晚 5 天。与 HSW 和 SMC 相比，AT10 与种子活力特性的关系更密切。加上 AT10 受环境影响较小这一事实，这些结果表明 AT10 可能是确定 IHT 的一个新指标。
