以4个双隐性（sh2sh2wxwx）甜糯玉米自交系和1个甜玉米自交系（sh2sh2）为材料,研究在不同播种深度下各材料的出苗情况,并比较不同类型材料的耐深播能力。结果表明：随播种深度的增加,玉米发芽率和活力指数逐渐降低,双隐性甜糯玉米自交...以4个双隐性（sh2sh2wxwx）甜糯玉米自交系和1个甜玉米自交系（sh2sh2）为材料,研究在不同播种深度下各材料的出苗情况,并比较不同类型材料的耐深播能力。结果表明：随播种深度的增加,玉米发芽率和活力指数逐渐降低,双隐性甜糯玉米自交系D6644的适宜播种深度为3-6 c m,甜玉米自交系S H-251、双隐性甜糯玉米自交系（D6624、京甜糯6、甜糯2）的适宜播深为3 c m。发芽率、活力指数与播种深度呈极显著负相关,中胚轴长度与播种深度呈显著正相关。展开更多
Waxy maize with its pure amylopectin starch is the staple food of many ethnic minorities in hilly regions of Southeast Asia （SEA）. A combination of waxy and quality protein maize （QPM） traits would improve the qua...Waxy maize with its pure amylopectin starch is the staple food of many ethnic minorities in hilly regions of Southeast Asia （SEA）. A combination of waxy and quality protein maize （QPM） traits would improve the quality of protein of waxy maize for human consumption. Double recessive waxy-QPM （wx-o2） genotypes had been generated from Southern Chinese material by haploid induction of crosses heterozygous for the two quality traits with an absolutely conserved waxy type and an improved amino acid profile. The vitreous kernel trait （due to the additional modifier genes present in QPM） was lost in the wx-o2 plant material; this may be due to the waxy mutation, this is anyhow desirable for acceptance as waxy maize is preferred due to its soft grains. The content of the quality limiting amino acid lysine was greatly increased in double recessive wx-o2 genotypes compared to standard waxy maize, but still with a high variation among genotypes for future improvement. Conclusively, it was indeed possible to combine two grain quality mutations successfully within one genotype and prototypes of double quality wx-o2 are available now to contribute to meet human requirements in essential amino acids and thus reduce malnutrition in various regions of Asia.展开更多
文摘以4个双隐性（sh2sh2wxwx）甜糯玉米自交系和1个甜玉米自交系（sh2sh2）为材料,研究在不同播种深度下各材料的出苗情况,并比较不同类型材料的耐深播能力。结果表明：随播种深度的增加,玉米发芽率和活力指数逐渐降低,双隐性甜糯玉米自交系D6644的适宜播种深度为3-6 c m,甜玉米自交系S H-251、双隐性甜糯玉米自交系（D6624、京甜糯6、甜糯2）的适宜播深为3 c m。发芽率、活力指数与播种深度呈极显著负相关,中胚轴长度与播种深度呈显著正相关。
文摘Waxy maize with its pure amylopectin starch is the staple food of many ethnic minorities in hilly regions of Southeast Asia （SEA）. A combination of waxy and quality protein maize （QPM） traits would improve the quality of protein of waxy maize for human consumption. Double recessive waxy-QPM （wx-o2） genotypes had been generated from Southern Chinese material by haploid induction of crosses heterozygous for the two quality traits with an absolutely conserved waxy type and an improved amino acid profile. The vitreous kernel trait （due to the additional modifier genes present in QPM） was lost in the wx-o2 plant material; this may be due to the waxy mutation, this is anyhow desirable for acceptance as waxy maize is preferred due to its soft grains. The content of the quality limiting amino acid lysine was greatly increased in double recessive wx-o2 genotypes compared to standard waxy maize, but still with a high variation among genotypes for future improvement. Conclusively, it was indeed possible to combine two grain quality mutations successfully within one genotype and prototypes of double quality wx-o2 are available now to contribute to meet human requirements in essential amino acids and thus reduce malnutrition in various regions of Asia.
