Naslov
Effect of Auxins on Pea Pericarp Growth

Autori
Reinecke, Dennis ; Ozga, Jocelyn ; Magnus, Volker

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Plant Physiology 105 (1, Supplement) ; ISSN 0032-0889 / Ort, Donald R. ; Raskin, Ilya ; Green, P. ; Ho, D. T.-H. ; DuPont, F. ; Randall, D. D. ; Siedow, James N. - Rockville (MD) : American Society of Plant Physiologists, 1994, 139-139

Skup
1994 Annual Meeting of the American Society of Plant Physiologists

Mjesto i datum
Portland (OR), Sjedinjene Američke Države, 30.07.1994. - 03.08.1994

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Pisum sativum; pea; pericarp; pod; indole-3-acetic acid; IAA; chloroindole-3-acetic acid; fluoroindole-3-acetic acid; structure-activity correlation

Sažetak
We have previously observed that 4-chloroindole-3-acetic acid (4-Cl-IAA) stimulates the growth of Pisum sativum pericarp (pea pods) in situ (Plant Physiol. 99, S-2). IAA and 4-Cl-IAA are naturally occurring auxins in pea fruit. To understand the function of auxin in pea fruit growth we are examining the effect of chemical substitution on auxin activity in the stimulation of pea pericarp growth. IAA, 4-, 5-, 6-, and 7-Cl-IAA were tested for their in situ activity. Exogenous 4-Cl-IAA (pericarp deseeded 2 days after anthesis was treated daily for 5-6 days) enhanced pericarp growth up to 4.6 fold (10^-4 to 10^-6 M) while IAA was ineffective. Silver thiosulfate, an ethylene action antagonist did not enhance IAA's activity. Chlorine substitution at positions 4, 5, 6 or 7 of the indole nucleus stimulated growth compared to the deseeded control, but the 4-substituted Cl-IAA was at least 2 times more active than other chlorinated auxins. The fluorinated IAA series (4-, 5-, 6-, and 7-F-IAA) was less active in stimulating pericarp growth than Cl-IAAs. In general, halogen substituted IAAs were more active than IAA in stimulating pericarp growth with the naturally occurring 4-Cl-IAA of pea being most active. We are currently measuring endogenous levels of 4-Cl-IAA and IAA during early pea fruit development ; further studies will monitor the rate of metabolism of auxins.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Biologija

POVEZANOST RADA