【摘要】 以茎瘤芥涪杂1号为试材,研究了瘤茎膨大后瘤茎性状的变化过程。结果表明:用Logistic方程y=k(1+e(a+bt)-1能很好地描述瘤茎纵径、横径、鲜样质量、干样质量的增长过程,而菜形指数的变化过程符合二次回归方程)y=a+b1t+b2t2。瘤茎纵径、横径、干样质量、鲜样质量线性增长始期分别出现在膨大后2.1-9.6d、17.8-19.7d、45.7～48.0d、46.0～50.5d,线性增长持续时间分别为61.6-78,1d、56.1～70.6d、32.9～34.8d、31.6～35.2d;增长高峰期出现在膨大后32.9-48.7d、45.8-55.0d、63.1～64.5d、63.5-66.3d,其最大增长速率分别高达每株每天0.17cm(纵径)、0.16cm(横径)、1.05g(Dw)、16.24g(Fw)。播种晚则瘤茎横径线性增长持续时间短,纵径、干鲜质量增长速率低,而菜形指数的变化由慢到快的递增演变为由快到慢的递减。更多还原

【Abstract】 Development process of tumorous stem characters were studied by using a mustard variety Fuza No. 1 sown on Aug 30 and Sep 9. The results showed that the development processes of vertical diameter, horizontal diameter,fresh weight and dry weight could be described by Logistic equation y= k(1+ e(a+bt))-1 and the tumorous stem index met the type of regression curve y=a+b1t+b2t2. The beginning of linear-growth period of vertical diameter,horizontal diameter,dry weight and fresh weight were 2.1-9.6 days, 17.8-19.7 days,45.7-48.0 days and 46.0-50. 5 days after tumorous stem development respectively. Their linear-growth periods were 61.6-78. 1 days,56.1-70.6 days,32.9-34.8 days and 31.6-35.2 days respectively. Shorter duration of linear-growth in horizontal diameter and lower rates of vertical diameter growth, fresh weight and dry weight were found in tumorous stem sown at late date. Variation of tumorous stem index was from slow to quick growth pattern in earlier sowing date, while from quick to slow growth pattern in later sowing date.更多还原