嘉兴水稻海南育种的品质差异及育种策略

经过对嘉兴香米、苏95-22等7个非糯水稻品种(系)海南和嘉兴不同育种条件下成熟稻米品质分析，发现与稻米商品品质密切相关的同一品种的直链淀粉含量、外观品质、食味等性状嘉兴和海南截然不同。分析其原因是抽穗后温度条件不同所致，即灌浆时期气温升高或降低，其直链淀粉含量、外观、食味等性状也随之发生变化。无论是早籼稻，还是晚粳稻，这种变化趋势完全一致。根据这一情况，异地育种或不同季节选育品种时，应根据温度条件不同，建立相应的检测指标，以提高针对性、减少品种选育的盲目性。其次，对优质水稻生产来说，改善栽培条件便可进一步提高稻米的食用品质。

The difference of the rice quality at the different breeding place and the useful policy

It is found that the quality of the same rice variety, which is related with commercial character such as the content of amylose ,white belly and eating quality et al is quite different through analyzing 7 rice varieties including 4 Indica and 3 Japonica rice varieties produced in Jiaxing and Hainan rice breeding bacees.It is clear that the difference is caused by the different temperature condition during the seed development after heading. That is, the higher of the temperature, the lower of the content of the amylase;On the contrary the lower of the temperature, the higher of the content of the amylose in the rice during the seed development after the heading stage. Therefore, when the rice breeding program is conducted at the different place or in the different season , the content of the amylose in rice should be different. Also the quality of rice can be improved through the adjustment of the seeding or heading stage.