Khanna-Chopra R, Dalal M, Kumar G P, Laloraya M
Water Technology Centre, Indian Agricultural Research Institute, New Delhi, India.
Biochem Biophys Res Commun. 1998 Jul 30;248(3):712-5. doi: 10.1006/bbrc.1998.9043.
A genetic system in wheat is described in which F1 produced by crossing a drought tolerant cultivar C306 and high yielding cultivar WL711 exhibits leaf necrosis leading to the death of the plant. The mechanism underlying hybrid necrosis is not yet known. The hybrid exhibited a higher level of superoxide anion compared to the healthy leaves of parents at similar developmental stages. This increase in superoxide generation preceded necrotic lesion formation and displayed a gradient from the leaf tip to base. The leaf tip where necrotic lesions make their first appearance exhibited a higher level of superoxide compared to the base. Superoxide anion thus appears to play a vital role in necrosis of leaves in F1 hybrid. This genetic system can be a model system for understanding cell death in higher plants.
本文描述了小麦中的一种遗传系统，其中耐旱品种C306与高产品种WL711杂交产生的F1代表现出叶片坏死，最终导致植株死亡。杂种坏死的潜在机制尚不清楚。与处于相似发育阶段的亲本健康叶片相比，该杂种表现出更高水平的超氧阴离子。超氧生成的这种增加先于坏死病斑形成，并呈现出从叶尖到叶基部的梯度。与叶基部相比，坏死病斑首次出现的叶尖表现出更高水平的超氧阴离子。因此，超氧阴离子似乎在F1杂种叶片坏死中起着至关重要的作用。该遗传系统可以作为理解高等植物细胞死亡的模型系统。
