Phytic Acid Metabolism in Lily (Lilium longiflorum Thunb.) Pollen 1
AUTOR(ES)
Lin, Jih-Jing
RESUMO
The accumulation of phytic acid during development of lily (Lilium longiflorum Thunb.) pollen and its degradation during germination have been studied. A substantial amount of phytic acid accumulates in lily pollen by 5 days before anthesis, and little change occurs during subsequent maturation. Mature lily pollen contains 7 to 8 micrograms phytic acid per milligram pollen. Considerable degradation of phytic acid occurs by 15 minutes of incubation in glucose culture medium, and very little is left by 3 hours. No partially phosphorylated myo-inositol accumulates during germination. The breakdown of phytic acid proceeds at a constant rate during this time period. The rate is calculated to be 0.037 microgram phytic acid/milligram pollen/minute. Two phytases are detected in germinated lily pollen extract using high performance liquid chromatography with an anion exchange column (diethylaminoethyl-5PW). The results suggest that one of the phytases is already present in mature ungerminated lily pollen and the other one is newly synthesized during germination from a long-lived, pre-existing mRNA.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1056370Documentos Relacionados
- Simulação da resposta à vernalização do lírio "Snow Queen" (Lilium longiflorum Thunb.)
- Vernalização afeta a mobilização de reservas de açúcares e nitrogênio e a emergência de plantas de lírio (Lilium longiflorum thunb.) ‘snow queen’
- Expression of the [beta]-Glucuronidase Gene in Pollen of Lily (Lilium longiflorum), Tobacco (Nicotiana tabacum), Nicotiana rustica, and Peony (Paeonia lactiflora) by Particle Bombardment.
- β-1, 3-Glucan Synthase from Lilium longiflorum Pollen 1
- Localization of Phosphorus and Cation Reserves in Lilium longiflorum Pollen 1