J Integr Plant Biol. ›› 2005, Vol. 47 ›› Issue (2): 187-193.DOI: 10.1111/j.1744-7909.2005.00031.x

• Research Articles • Previous Articles     Next Articles

Thermal Hardening: A New Seed Vigor Enhancement Tool in Rice

Muhammad FAROOQ, S. M. A. BASRA, Nazir AHMAD and K. HAFEEZ   

  • Online:2005-03-01 Published:2005-02-01

Abstract: In a laboratory study, indica and japonica rice (Oryza sativa L.) seeds were exposed to thermal hardening (heating followed by chilling followed by heating; chilling followed by heating followed by chilling; heating followed by chilling or chilling followed by heating). In indica rice, heating followed by chilling followed by heating resulted in decreased mean germination time, time to start germination, electrical conductivity of seed leachates, and time to 50% germination, as well as increased germination index, energy of germination, radicle and plumule length, root length, root/shoot ratio, root fresh and dry weight, radicle and plumule growth rate, and shoot fresh weight. In japonica rice, chilling followed by heating followed by chilling performed better than all other treatments, including control.

Key words: germination, indica rice, japonica rice, seedling vigor, thermal hardening.

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2021 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q
备案号:京ICP备16067583号-22