Effect of 2,4-dichlorophenoxyacetic acid on the structure and function of developing chloroplasts.

Abstract:

:Dark-grown radish seedlings (Raphanus sativus L.) were sprayed with 10(-3) mol·l(-1) 2,4-dichlorophenoxyacetic acid and then were exposed to a 14:10 light: dark cycle. Cotyledon samples from these seedlings and unsprayed controls were taken for electron microscopy, chlorophyll determinations, and photosynthetic rate measurements at regular intervals for 72 h. A normal development of etioplasts to chloroplasts with formation of typical grana-fret work system was observed in the control cotyledons. The chloroplasts in the 2,4-D-treated cotyledons showed changes in the organization of the grana thylakoids; these thylakoids being more appressed to each other than in the controls. The chlorophyll content of treated plants was less than that of controls but the rate of chlorophyll biosynthesis was unaffected. The photosynthetic rate/mg chlorophyll was considerably higher for treated plants suggesting that 2,4-D treatment resulted in decreased size of the photosynthetic unit.

journal_name

Planta

journal_title

Planta

authors

Nadakavukaren MJ,McCracken DA

doi

10.1007/BF00394437

subject

Has Abstract

pub_date

1977-01-01 00:00:00

pages

65-9

issue

1

eissn

0032-0935

issn

1432-2048

journal_volume

137

pub_type

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