在玉米中,基底茎强度的宁单体和纤维素的空间积累
Jianping Yang1, Meng Li1, Yue Yin1
1State Key Laboratory of Wheat and Maize Crop Science, Collaborative Innovation Center of Henan Grain Crops, Center for Crop Genome Engineering, College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China.
Plant physiology and biochemistry : PPB
|July 10, 2024
概括
玉米茎的强度对产量和收获至关重要,受素和纤维素的影响. 这项研究揭示了不同组织中特定的红素类型和纤维素水平是防止沉积的关键.
科学领域:
- 植物生物学 植物生物学
- 农业科学 农业科学
- 生物化学 生物化学
背景情况:
- 寄宿对玉米产量,质量和收获效率产生重大影响.
- 干支强度是影响玉米存放的主要因素.
- 虽然素和纤维素与茎的强度有关,但它们在玉米中的组织特异性作用尚不清楚.
研究的目的:
- 为了研究在玉米组织中的素单体 (G和S) 和纤维素的空间积累.
- 为了确定参与与茎强度相关的素生物合成的候选基因.
- 为了阐明细胞壁组件和玉米茎强度之间的关系.
主要方法:
- 在不同玉米组织和内部节点中量化G和S素单体和纤维素.
- 对氨酸生物合成基因表达模式的分析.
- 在不同的玉米系中,细胞壁组件和茎强度之间的相关性分析.
- 对bm3突变体进行检查,该突变体在咖啡酸甲基转移酶 (COMT) 中失去了功能.
主要成果:
- G和S素单体在根,茎皮和叶脉中最为丰富,相应的高基因表达.
- 纤维素水平在根部是最低的.
- 在第2至第4个内部节点,频繁发生茎断裂的部位,S-lignin和相关基因表达的显著减少发生.
- 的强度与G素,S素和纤维素正相关,但与S/G比率负相关.
- bm3突变 (缺乏COMT活性) 显示了茎的强度降低.
结论:
- 玉米茎的强度取决于树脂单体和纤维素的组织特异性积累.
- 特定的素生物合成基因被确定为与茎强度相关的候选者.
- 细胞壁组件的基因工程有可能提高玉米茎的强度和抵御性.
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