重庆中高海拔区榨菜菜头干物质累积与形状的动态变化

为榨菜育种和栽培提供参考依据,以榨菜品种永安小叶为试材,采用对比法研究重庆中高海拔区(海拔700m)和低海拔区(海拔300 m)榨菜膨大后菜头干物质累积和形状变化的动态规律。结果表明:不同海拔区菜头干物质的变化均呈"S"型曲线,用Logistic方程y=k/1+e~((a+bt))]可很好地拟合,膨大后45~48d进入线性增长期,线性增长持续时间33~35d,增长高峰期在膨大后64d左右;低海拔区菜头干物质最大增长速率达1.04g/(株·d),较中高海拔区提高40.54%;低海拔区菜头干物质累积量明显高于中高海拔区。菜头增长期,中高海拔区菜头形状指数低于低海拔区,呈由快到慢地下降,而低海拔区则呈由慢到快地下降,其变化过程均符合二次回归方程y=a+b1t+b2t 2。

Dynamics Change of Dry Matter Accumulation and Shape of Tumorous Stem of Mustard in Middle-high Altitude Areas in Chongqing

Dynamics change process of dry matter and shape of tumorous stem were studied by using a mustard variety Yongan Xiaoye in the low(300 m) and middle-high altitude(700 m) areas in Chongqing by contrast design to provide references for breeding and cultivation of tumorous stem mustard.Results: Dry matter accumulated along S type curve, and could be described by logistic equation y=k/1+e(a+bt)].The beginning of linear-growth period and period of maximum growth rate of dry matter weight was 45~48 days and 64 days or so after tumorous stem development respectively, linear-growth duration was 33~35 days.The maximum growth rate of dry matter in the low altitude areas could reach 1.04 gDW/(plant·d) and was increased by 40.54% compared with that in the middle-high altitude areas, dry matter accumulation in low altitude areas was significantly higher than that in middle-high altitude areas.In the process of tumorous stem growth, shape index of tumorous stem in middle-high altitude areas was lower than that in low altitude areas and from fast to slow down.Shape index of tumorous stem met the type of regression curve y=a+b1t+b2t2.