The response of soybean seed growth characteristics to increased temperature under near-field conditions in a temperature gradient chamber

详细信息	查看全文 | 推荐本文 |

• 作者：Custodio R.P. Tacarindua^a ; ^{ctacarindua@kais.kyoto-u.ac.jp} ; Tatsuhiko Shiraiwa^a ; Koki Homma^a ; Etsushi Kumagai^b ; Ryoji Sameshima^b
• 关键词：EFP ; effective seed-filling period ; SGR ; individual seed growth rate ; TGC ; temperature gradient chamber ; VPD ; vapor pressure deficit
• 刊名：Field Crops Research
• 出版年：2012
• 期刊代码：44_03784290
• 类别：abs
• 出版时间：13 May, 2012
• 卷：131
• 期：Complete
• 页码：26-31
• 文件大小：552 K

摘要

Global warming and increasing soybean production in warm regions require a quantitative understanding of how yield-formation processes of this crop are affected by high temperatures. The response of soybean growth to increased temperature was examined under a controlled environment that mimics field conditions using a temperature gradient chamber (TGC). In 2009 and 2010, the (cv) Enrei cultivar was grown in soil culture beds (1 m 脳 24 m) in two TGCs. Three temperature treatments, T_a (near ambient temperature), T_a + 1 (ambient temperature +1 掳C) and T_a + 3 (ambient temperature +3 掳C), were established by dividing the rows along which the temperature gradient was created. In 2009, only cvs. Ryuho and Suzuyutaka were grown under two temperature regimes. The mean temperatures in 2009 and 2010 for the entire growth period ranged from 25.9 to 28.7 掳C and from 27.1 to 30.1 掳C for T_a and T_a + 3, respectively. The individual seed growth rate (SGR) was determined as the linear coefficient of the single-seed weight vs. time (d), based on periodic plant harvesting. The effective seed-filling period (EFP) was calculated by dividing the final single-seed weight by the SGR. The flowering date was affected by increased temperature only in 2010. The days to beginning of seed fill and maturity were longer under higher temperatures. The SGR was slower at T_a + 3 (7.1 and 5.9 mg seed^鈭? d^鈭? in 2009 and 2010, respectively) than at T_a (8.5 and 7.5 mg seed^鈭? d^鈭? in 2009 and 2010, respectively), whereas the EFP was longer under high temperatures than at near ambient temperature. The final single-seed weight was reduced by increased temperatures. The temperature had no significant effect on cell volume, but the number of cells per cotyledon was smaller at T_a + 3 (3.4 脳 10⁶ and 2.6 脳 10⁶ in 2009 and 2010, respectively) than at T_a (5.0 脳 10⁶ and 4.3 脳 10⁶). The results indicated that an increase in temperature by 3 掳C in warm regions decreased the seed size of soybean by decreasing the cell number and SGR.