Influence of new terpenoid analogue of abscisic acid on chilling resistance of rice seedlings.
1988
Flores A.A. | Dorffling K. | Vergara B.S.
The effect of the new terpenoid analogue of abscisic acid of the acetylene- acetate type coded LAB 173711 on resistance to chilling in 14-d-old rice seedlings was studied. Seedlings were sprayed with LAB 173711, at 10 to the minus 3 power mol/liter, maintained in a glasshouse at 29/21 deg C day/night temperature, 12 h photoperiod, and 80% relative humidity for 24 h, then transferred to a chamber at 5 deg C temperature for 3 and 5 d. Recovery in the glasshouse was monitored for several days. Survival in unprotected plants chilled for 3 d was 60% 2 d after treatment (DAT); no plants survived 5 DAT. Plants sprayed with LAB 173711 had 100% survival. The number of plants surviving 5 deg C for 5 d was similar. The analogue also protected the root system. The number of adventitious roots, root length, and root weight were higher in treated plants. The stability of the root system may contribute to the increased survival rate in protected plants. The increase in chilling tolerance may also be due to the direct action of analogue 173711 on stomatal closure; that prevented water loss through transpiration.
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