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以百农矮抗58为材料,采用大田试验的方法,研究了在始穗期喷施不同浓度(10mg/L、30 mg、50 mg/L)的5-氨基乙酰戊酸(5-Aminolevulinic acid,ALA)对冬小麦不同粒位籽粒灌浆特性的影响.应用Richards方程对10～50 mg/L ALA处理下冬小麦3个粒位(第Ⅰ、Ⅱ、Ⅲ粒位)的籽粒灌浆过程进行了模拟.建立在Richards方程基础上的籽粒生长分析显示:与对照相比,10～50 mg/L ALA处理使第Ⅰ和第Ⅲ粒位的千粒重分别增加了1.3～2.4g、3.4～4.7,较对照差异显著,第Ⅱ粒位的粒重与对照差异不显著;10～50 mg/L ALA处理使冬小麦3个粒位籽粒的平均灌浆速率和最大灌浆速率增大,灌浆活跃持续期延长,到达最大灌浆速率的时间提前.阶段灌浆特征参数的比较表明,在籽粒灌浆的渐增期,10～50 mg/L ALA处理使冬小麦3个粒位籽粒的平均灌浆速率增加,灌浆持续期缩短;在籽粒灌浆的快增期,使3个粒位籽粒的平均灌浆速率增加,灌浆持续期延长.在籽粒灌浆的缓增期,使强势粒(第Ⅰ、第Ⅱ粒位)的平均灌浆速率减小,灌浆持续期延长,但使弱势粒(第Ⅲ粒位)的平均灌浆速率增加,灌浆持续期延长.表明在灌浆的前期和中期,10～50 mg/L ALA处理可促进各粒位籽粒提早启动灌浆,并提高其灌浆速率,在灌浆后期减弱了强势粒对弱势粒籽粒灌浆充实的优势,从而有利于弱势粒的灌浆充实.从总体上讲,10～50 mg/L ALA对弱势粒(第Ⅲ粒位)粒重的影响程度大于强势粒(第Ⅰ和第Ⅱ粒位),其中30 mg/L ALA促进籽粒增重的效果最明显.
In this study, field experiments were carried out to study the effects of 5-Aminolevulinic acid (5-Aminolevulinic acid) with different concentrations (10mg / L, 30mg, 50mg / L) , ALA) on Grain Filling Characteristics at Different Grain Positions of Wheat. The grain filling process of 3 grain positions (Ⅰ, Ⅱ, Ⅲ grain) of winter wheat under 10-50 mg / L ALA treatment was simulated by Richards equation. The grain growth analysis based on the Richards equation showed that compared with the control, 10 ~ 50 mg / L ALA treatment increased the 1000-grain weight of the first and the third grain positions by 1.3 ~ 2.4g and 3.4 ~ 4.7, respectively, Significantly, there was no significant difference between the grain weight of the second position and the control. The ALA treatment at 10 ~ 50 mg / L increased the average grain filling rate and the maximum grain filling rate of the three grain loci, prolonged the active duration of grain filling and reached the maximum grouting The results showed that the average grain filling rate of three grains in winter wheat increased and the duration of grain filling shortened with 10 ~ 50 mg / L ALA treatment during the gradual growth stage of grain filling. Of the fast increase, so that the average grain filling rate of three grains increased , And the duration of grain filling prolonged.When grain filling slowly increased, the average grain filling rate of strong grains (I and II grains) decreased and the duration of grain filling prolonged, but the average grain size of inferior grains The results showed that 10 ~ 50 mg / L ALA could promote early grain filling and increase grain filling rate in the early and middle stages of grain filling, and weaken the effect of strong grain on weak The effect of 10 ~ 50 mg / L ALA on the grain weight of inferior grains (grain number Ⅲ) was greater than that of strong grains (Ⅰ and Ⅰ) Ⅱ grain), of which 30 mg / L ALA had the most obvious effect on grain weight gain.