Inhibition of plant growth by irradiation. II. Sensitivity and development

✍ Scribed by Quastler, Henry ;Baer, Marianne

• Publisher: Wiley (John Wiley & Sons)
• Year: 1949
• Tongue: English
• Weight: 652 KB
• Volume: 33
• Category: Article
• ISSN: 0095-9898
• DOI: 10.1002/jcp.1030330306

✦ Synopsis

Departments of Physies am7 of ZOOlOgy, 77nzoemity of Illinois,

OKE FIGURE

I n a previous paper we described the stunting which occurs after x-irradiation of dry seeds of Uung beans (Phaseolus aureus). The present report deals with responses to irradiations administered to young growing seedlings. Plant material, culture method, and irradiation tcchiiiyues were the same as before (Quastler and Bacr, '48).

Growing seedlings aye more radioseiisitive than dry seeds. This fact has been lrnown for a long time (Koernicke '04; Henshaw and Francis, '33, '35). What w e have to add is a comprehensive, quantitative description of early developmental changes of sensitivity. An obvious generalization of the concept of sensitivity leads to a definition which can be used to compare sensitivities 011 the basis of equal radiation responses (section I). The developmental rise of sensitivity was measured on the basis of moderate stunting of primary roots (section 11). The same trend, but with marked quantitative differences, was found f o r other types of reaction of the root (section 111) and for another part of the plant (section IV).