辣韭矢竹的出笋及幼竹生长节律

Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70.19%. The height growth could be divided into initial, ascending, boosting and terminal stage.Daily increment of height growth was 1～2 cm at the initial stage(about 11 d), 2～3 cm at the ascending one(12 d), more than 3 cm at the boosting one(19 d). The maximum was 4.45 cm at boosting stage. By the terminal stage (4 d), the height growth decreased obviously and stopped rapidly at last. Height growth process of young bamboo accorded with the Logistic Equation. But the height growth was influenced by the underground temperature of 10 cm and 15 cm, as well as average daily temperature and the humidity, especially the underground temperature of 10 cm and 15 cm which had positive correlation with the daily increment of height growth.

植物生长延缓剂对越冬期辣韭矢竹组培苗生长的影响

植物生长延缓剂能够抑制植物细胞生长,使植株长得粗壮,根系发达,从而增强植物的抗逆性。试验研究了不同浓度的植物生长延缓剂矮壮素(CCC)和多效唑(PP_(333))对越冬期辣韭矢竹组培苗生长的影响。结果表明:经CCC和PP_(333)处理后的苗木,植株高生长明显降低,而分枝率和分蘖率显著增加;对植株叶绿素荧光参数的影响表现为,PSⅡ最大光化学效率(Fv/Fm)、非光化学猝灭系数(NPQ)和电子传递速率(ETR)均显著上升,光化学量子效率(ΦPSII)和光化学猝灭系数(qP)均显著下降,表明竹苗接受和传递光电子的能力增强,光合潜力上升,光机构得到保护,受低温伤害减轻,植株抗寒性增强。比较不同浓度CCC和PP_(333)的处理效果显示,800 mg/L的PP_(333)和3 000 mg/L的CCC处理的植株均有较好的抗寒能力。综合来看,3 000 mg/L的CCC对辣韭矢竹苗在寒冷条件下的保护最全面。