Effect of oxygen concentration on leaf photosynthesis and resistances to carbon dioxide diffusion

✍ Scribed by M. M. Ludlow

• Publisher: Springer-Verlag
• Year: 1970
• Tongue: English
• Weight: 48 KB
• Volume: 94
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00386139

✦ Synopsis

GAs and Seeds of Ruellia humilis

Results similar to those presented in the Table were obtained by soaking seeds of R. humilis for 48 hr in GA s solutions or by keeping seeds on filter paper moistened with solutions of gibberellie acid throughout the germination period.

In nature seeds of R. humilis mature and are dispersed in autumn. During the winter they undergo a period of low-temperature afterripening and then germinate at the higher spring temperatures. Replacement of the chilling requirement in seeds of R. humilis by GA s may mean that gibbereUins are synthesized during the winter dormant period in nature. In seeds of Corylus avellana endogenous gibberellins were found in chilled but not in non-chilled seeds (Frankland and Wareing, 1962).