杂交水稻超高产制种的技术关键

Key Techniques in the Super-high Yielding Seed Production of Hybrid Rice

阐明了杂交水稻超高产制种关键技术 :(1)安排母本比父本早 2天抽穗以充分利用父本初散花粉 ;(2 )利用药物刺激剑叶叶枕分生组织 ,创造最佳授粉态势 ;(3)利用柱头外露敏感期进行特殊技术处理 ,提高母本柱头外露率及柱头外露体积 ;(4 )

The key technical points in the super-high yielding seed production of hybrid rice were summarized as follows: (1) Adjusting the standard for synchronization of flowering to make the seed parent head two days earlier than the pollen parent. (2) Through cultural practices and chemical stimulus to acquire optimum pollination posture with the flag leaf length of the seed parent of 17±2 cm, the flag leaf angle≥90° and the pollen parent 15～20 cm higher than the seed parent. (3) Adopting special treatments in the sensitive stage of stigma exsertion to increase stigma exsertion rate and exserted stigma surface area. (4) Conducting supplementary pollination during the pollen-shedding peak time. (5) Widening the female-to-male row ratio and establishing high-yielding population structure to ensure sufficient spikelets of both parents needed for super-high yielding. For the seed parent, using 60～67.5kg seeds per ha. seed production plot and transplanting two seedlings per hill. For the pollen parent, using 15～18.75 kg seeds per ha. seed production plot and transplanting two or more seedlings per hill.