State Key Laboratory of Crop Biology, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, Shandong 271018, China.
Plant Physiol Biochem. 2013 Sep;70:69-80. doi: 10.1016/j.plaphy.2013.04.024. Epub 2013 May 15.
This study investigated changes in leaf abscisic acid (ABA) concentrations and grain ABA concentrations in two maize cultivars and analyzed the following relationships under different water/nitrogen treatments: leaf ABA concentrations and photosynthetic parameters; leaf ABA concentrations and grain ABA concentrations; leaf/grain ABA concentrations and grain-filling parameters; and aldehyde oxidase (AO, EC 1.2.3.1) activities and ABA concentrations. The ear leaf average AO activities and ABA concentrations were lower in the controlled release urea treatments compared with the conventional urea treatments. The average AO activities in the grains were higher in the controlled release urea treatments, and the ABA concentrations were significantly increased at 11-30 DAF. The Pn and ABA concentrations in ear leaves were negatively correlated. And the Gmean were positively correlated with the grain ABA concentrations at 11-30 DAF and negatively correlated with the leaf ABA concentrations at 20 and 40-50 DAF. The grain ABA concentrations and leaf ABA concentrations were positively correlated. Thus, the Gmean were closely related to the AO activities and to the ear leaf and grain ABA concentrations. As compared to other treatments, the subsoiling and controlled release urea treatment promoted the uptake of water and nitrogen by maize, increased the photosynthetic capacity of the ear leaves, increased the grain-filling rate, and improved the movement of photosynthetic assimilates toward the developing grains. In the cultivar Z958, higher ABA concentrations in grains at 11-30 DAF and lower ABA concentrations in ear leaves during the late grain-filling stage, resulted in higher grain-filling rate and increased accumulation of photosynthetic products (relative to the cultivar D3).
本研究调查了两个玉米品种在不同水氮处理下叶片脱落酸（ABA）浓度和籽粒 ABA 浓度的变化，并分析了以下关系：叶片 ABA 浓度与光合参数；叶片 ABA 浓度与籽粒 ABA 浓度；叶片/籽粒 ABA 浓度与籽粒灌浆参数；醛氧化酶（AO，EC 1.2.3.1）活性与 ABA 浓度。与常规尿素处理相比，控释尿素处理下穗位叶平均 AO 活性和 ABA 浓度较低。控释尿素处理下籽粒平均 AO 活性较高，ABA 浓度在 11-30 DAF 时显著增加。穗位叶 Pn 和 ABA 浓度呈负相关。Gmean 与 11-30 DAF 时的籽粒 ABA 浓度呈正相关，与 20 和 40-50 DAF 时的叶片 ABA 浓度呈负相关。籽粒 ABA 浓度与叶片 ABA 浓度呈正相关。因此，Gmean 与 AO 活性以及穗位叶和籽粒 ABA 浓度密切相关。与其他处理相比，深松和控释尿素处理促进了玉米对水氮的吸收，提高了穗位叶的光合能力，提高了籽粒灌浆速率，改善了光合产物向发育籽粒的运转。在品种 Z958 中，11-30 DAF 时籽粒 ABA 浓度较高，后期灌浆阶段穗位叶 ABA 浓度较低，导致籽粒灌浆速率较高，光合产物积累增加（相对于品种 D3）。
