Chinese Journal of Applied Ecology
Previous Articles Next Articles
LI Sheng-li1, BI Ming-ming1, CHEN Fei2, SUN Zhi-qiang1
Online:
Published:
Abstract: To explore the dwarfing mechanism of tomato seedlings induced by coldshock treatment followed by high temperature, tomato seedlings were subjected to coldshock treatment once a day at 8:00 with temperature of 5, 10 and 15 ℃ for 10, 20 and 30 min, respectively, and ethylene production rate was measured. Plant height, ethylene production and gibberellin (GA3) content of the seedlings treated with T10 ℃D10 min (coldshock with 10 ℃ for 10 min), coupled with utilization of growth regulators, were also evaluated. The results showed that the release of ethylene was increased with the decrease of coldshock temperature and extension of treatment time. The coldshock treatment of 5 ℃ and 30 min had the highest ethylene production rate of 60.3 nL·h-1·g-1, which was 6.5 times of the control. None of ethephon (ETH), silver thiosulphate (STS), GA3 or paclobutrazol (PP333) could completely block high ethylene production induced by coldshock treatment. Tomato seedlings with coldshock treatment (T10 ℃D10 min) resulted in reduction in GA3 content by 38.1% compared with the value of control (130.6 μg·g-1). Neither ethephon nor STS had significant effect on the dwarfing induced by coldshock. However, GA3 weakened the dwarfing effect induced by coldshock treatment (T10 ℃D10 min), while PP333 greatly enhanced it. The dwarfing effect by coldshock treatment of T10 ℃D10 min was equivalent to that of application of 4.0 mg·L-1 PP333 based on the seedling height as an evaluation indicator. It was concluded that coldshock treatment stimulated shoot ethylene production and blocked GA3 synthesis. GA3 played a vital role in dwarfing effect on tomato seedling induced by cold-shock treatment. Coldshock with 10 ℃ and duration of 10 min could promote the growth of tomato seedlings with shorter stem and higher dry mass accumulation.
LI Sheng-li1, BI Ming-ming1, CHEN Fei2, SUN Zhi-qiang1. Mechanism of dwarfing effect of tomato (Solanum lycopersicon) seedlings induced by cold-shock treatment under high temperature stress.[J]. Chinese Journal of Applied Ecology.
/ Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://www.cjae.net/EN/abstract/abstract11906.shtml
https://www.cjae.net/EN/Y2015/V26/I7/2063