TITLE	Photosynthetic potentials of in vitro-grown juvenile, adult, and rejuvenated Sequoia sempervirens (D. Don) Endl. shoots
AUTHOR	Li-Chun Huang Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan 11529 Jui-Hsi Weng Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan 11529 Chiu-Hui Wang Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan 11529 Ching-I Kuo Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan 11529 Yuh-Jang Shieh* Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan 11529
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ABSTRACT	In vitro shoot tips of Sequoia sempervirens (D. Don.) Endl.¡Xincluding a juvenile, two adult, and two rejuvenated adult clones¡Xwere examined for differences in basic physiological characteristics. Moisture contents were the same, around 85%, for all tissues regardless of origin. Growth rates, determined by fresh weight increase and shoot elongation, were higher for the juvenile and rejuvenated shoots. They correlated with higher total nitrogen contents. Juvenile and rejuvenated shoots also showed higher rates of photosynthesis and respiration, evidenced by faster O2 evolution and consumption. The photosynthetic rates were associated with more chlorophyll, especially chlorophyll a, in the juvenile and the rejuvenated shoots. Nevertheless, identical quantum efficiencies of photosystem II indicated the same photosystems were operating and with equal effectiveness in juvenile, adult, and rejuvenated tissues.
KEYWORD	Phase change; Photosynthesis; Respiration; Sequoia sempervirens; Total nitrogen content;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 44 Number 1 January 2003, page 31-35, 5 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China