Plant Diversity ›› 2009, Vol. 31 ›› Issue (03): 239-246.DOI: 10.3724 SP.J.1143.2009.08216

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Temporal Pattern of Changes in Desiccation Tolerance during Imbibition of Pisum sativum Seeds

SONG Song-Quan1 , Patricia BERJAK2 , Norman W . PAMMENTER2   

  1. 1 Institute of Botany , Chinese Academy of Sciences, Beijing 100093 , China ; 2 School of Biological and Conservation Sciences , University of KwaZulu-Natal, Durban 4041 , South Africa
  • Received:2008-11-30 Online:2009-06-25 Published:2009-06-25

Abstract: Changes in desiccation tolerance of pea ( Pisum sativum) seeds during imbibition were studied in this paper. Water uptook by seeds was initially rapid , and then slowly increased until a plateau was reached . Rate of electrolyte leakage increased initially until 11 h , and then declined with imbibition . During imbibition , germination percentage of seeds gradually increased , and water content at which 10% and 50% of seeds and axes were killed by subsequent dehydration significantly increased while desiccation tolerance of seeds and axes was progressively lost . Gibberellin and abscisic acid altered seed germination characteristics and improved desiccation tolerance of axes . These results showed that the loss of desiccation tolerance of imbibed pea seeds was a quantitative feature, and the changes in desiccation tolerance of imbibing orthodox seeds could serve as a model system for the study of seed recalcitrance .

Key words: Abscisic acid, Recalcitrant

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