Growth and ecophysiology of western redcedar (Thuja plicata Donn ex. D. Don) seedlings grown under three different shade conditions

Content Provider	Semantic Scholar
Author	Sasaerila, Yorianta
Copyright Year	1994
Abstract	Western redcedar was greenhouse grown from seed under three shade conditions: 100% (Full Sun, FS), 49% (Moderate Shade, MS), and 27% (Deep Shade, DS) of ambient light. Samples were taken periodically over their first, second and third growing season for growth analysis, chlorophyll-a fluorescence, C02 exchange rates and pigment content. Different light growing environments showed a significant effect (ac0.05) on most growth components: root weight ratio (RWR), leaf weight ratio (LWR), specific leaf area (SLA), and leaf area ratio (LAR) of western redcedar, with the best growth occurring under moderate shade. All treatments exhibited a similar pattern in RGR for shoot and total plant biomass. RGR root was significantly higher (a<0.05) in FS seedlings in the first year growth. Seedlings allocated more dry matter to shoot than to root as growth light intensity decreased. Consistently higher root to shoot (R/S) ratios in FS seedlings were found with mean R/S ratios for 1990, 1991 and 1992 of 0.46, 0.62, 0.54 compared to 0.31, 0.32 and 0.28 for MS, and 0.25, 0.26, 0.28 for DS seedlings respectively. In general, FS seedlings had lower chlorophyll-a,b and total chlorophyll ( a + b ) , but higher carotenoid to chlorophyll (car/chl) ratio than MS and DS seedlings.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://summit.sfu.ca/system/files/iritems1/6587/b16964603.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article