Effect of submergence and shading of hypocotyls on leaf conductance in young seedlings of the mangrove Rhizophora stylosa

Autor:	Yoshiaki Kitaya, Yoshiyuki Kawabata, Nobutaka Monji, Masayuki Sumiyoshi
Rok vydání:	2002
Předmět:	Ecology biology Physiology ved/biology ved/biology.organism_classification_rank.species Rhizophoraceae Plant physiology Forestry Plant Science Rhizophora stylosa biology.organism_classification Photosynthesis Hypocotyl Submersion (mathematics) Botany Shading Respiration rate
Zdroj:	Trees. 16:147-149
ISSN:	1432-2285 0931-1890
Popis:	Effects of submergence and shading of hypocotyls on leaf conductance were examined in 12- to 18-month-old seedlings of Rhizophora stylosa. The net photosynthetic rates of hypocotyls increased with increase in incident photosynthetic photon flux density (PPFD) to a maximum of 2.7 µmol CO2 m–2 s–1 at a PPFD of about 300 µmol m–2 s–1. This maximal photosynthetic rate was 80% of the dark respiration rate in the hypocotyls. The leaf conductance was suppressed by 20% when hypocotyls were submerged and by 40% when hypocotyls were both submerged and shielded from incident sunlight. Thus, extended submergence or shading of hypocotyls adversely affected photosynthetic carbon gain by leaves, which could, in turn, retard growth of young seedlings.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c1e1e85b397847f8d5b577db284c7c9f https://doi.org/10.1007/s00468-002-0165-7 Zobrazit plný text záznamu Full text from SpringerLink