EurekaMag
+ Translate
+ Most Popular
Advantages and disadvantages of bordeaux mixture and of lime-sulphur used on apples in the growing season
Observations on the Umaria marine bed
10 years of hearing conservation in the Royal Air Force
Chocolate crumb - dairy ingredient for milk chocolate
Effect of daily gelatin ingestion on human scalp hair
Comparison of rice bran and maize bran as feeds for growing and fattening pigs
The composition of pampas-grass (Cortaderia argentea.)
The Accraian Series:
The mechanism of the Liebermann-Burchard reaction of sterols and triterpenes and their esters
Cerebrovascular Doppler ultrasound studies (cv-Doppler)
Toria: PT-303 - first national variety
Hair growth promoting activity of tridax procumbens
Productivity of Pekin x Khaki Campbell ducks
A stable cytosolic expression of VH antibody fragment directed against PVY NIa protein in transgenic potato plant confers partial protection against the virus
Solar treatment of wheat loose smut
Swimmers itch in the Lake of Garda
Bactofugation and the Bactotherm process
The effects of prefrontal lobotomy on aggressive behavior in dogs
Visual rating scales for screening whorl-stage corn for resistance to fall armyworm
Breakdown of seamounts at the trench axis, viewed from gravity anomaly
Kooken; pennsylvania's toughest cave
Recovery of new dinosaur and other fossils from the Early Cretaceous Arundel Clay facies (Potomac Group) of central Maryland, U.S.A
Zubor horny (Bison bonasus) v prirodnych podmienkach Slovensku
The extended Widal test in the diagnosis of fevers due to Salmonella infection
Hair of the american mastodon indicates an adaptation to a semi aquatic habitat

Dependence of needle architecture and chemical composition on canopy light availability in three North American Pinus species with contrasting needle length


Dependence of needle architecture and chemical composition on canopy light availability in three North American Pinus species with contrasting needle length



Tree physiology 22(11): 747-761



ISSN/ISBN: 0829-318X

PMID: 12184979

DOI: 10.1093/treephys/22.11.747

Morphology and chemical composition of needles of shade-intolerant southern conifers (Pinus palustris Mill. (mean needle length +/- SD = 29.1 +/- 4.1 cm), P. taeda L. (12.3 +/- 2.9 cm) and P. virginiana Mill. (5.1 +/- 0.8 cm)) were studied to test the hypothesis that foliage acclimation potential to canopy light gradients is generally low for shade-intolerant species, and in particular, because of mechanical limitations, in species with longer needles. Plasticity for each needle variable was defined as the slope of the foliar characteristic versus irradiance relationship. A novel geometrical model for needle area and volume calculation was employed for the three-needled species P. palustris and P. taeda. Needle thickness (T) strongly increased, but width (W) was less variable with increasing daily integrated quantum flux density averaged over the season (Q(int)), resulting in changes in cross-sectional needle shape that were manifested in a positive relationship between the total to projected needle area ratio (A(T)/A(P)) and Q(int) in the three-needled species. In contrast, cross-sectional needle geometry was only slightly modified by irradiance in the two-needled conifer P. virginiana. Needle dry mass per unit total needle area (M(T)) was positively related to Q(int) in all species, leading to greater foliar nitrogen contents per unit area at higher irradiances. Separate examination of the components of M(T) (density (D) and the volume (V) to A(T) ratio; M(T) = DV/A(T)) indicated that the positive effect of light on M(T) resulted solely from increases in V/A(T), i.e., from increases in the thickness of foliage elements. Foliar chlorophyll content per unit mass increased with increasing Q(int), allowing an improvement in light-harvesting efficiency in low light. The variables characterizing needle material properties (D, the dry to fresh mass ratio, and needle carbon content per unit mass) were generally independent of Q(int), suggesting that needles were less stiff and had greater tip deflections under their own weight at lower irradiances because of smaller W and T. Comparisons with the literature revealed that plasticity in foliar characteristics tended to be lower in the studied shade- intolerant species than in shade-tolerant conifers, but plasticity among the investigated species was unaffected by needle length. However, we argue that, because of mechanical limitations, plastic changes in needle cross section in response to low irradiance may decrease rather than increase light-interception efficiency in long-needled species.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 003702957

Download citation: RISBibTeXText

Related references

Effects of light availability and tree size on the architecture of assimilative surface in the canopy of Picea abies: variation in needle morphology. Tree Physiology 15(5): 307-315, 1995

Study for estimation of needle area of sugi stand: the relationship between needle area per shoot length and light conditions within the canopy. Bulletin of the Kyushu University Forests 72: 63-71, 1995

Needle blight and needle droop on pinus sylvestris in europe and pinus resinosa in north america diptera cecidomyiidae. Zeitschrift Fuer Angewandte Entomologie: 421-428, 1973

Specific needle area of Scots pine and its dependence on light conditions inside the canopy. Silva Fennica 15(2): 190-198, 1981

'Needle blight' and 'needle droop' on Pinus silvestris L. in Europe and P. resinosa Ait. in North America (Diptera, Cecidomyiidae). Zeitschrift fur Angewandte Entomologie 72(4): 421-428, 1973

The composition of needle wax of Pinus sylvestris in relation to provenance and needle age, and its significance for susceptibility to attack by Lophodermium pinastri. Flora, German Democratic Re ic 161(516): 604-622, 1972

Needle length and incidence of local reactions to immunization. Needle gauge is more important than needle length. Bmj 322(7284): 492, 2001

Needle longevity, shoot growth and branching frequency in relation to site fertility and within-canopy light conditions in Pinus sylvestris. Annals of Forest Science 60(3): 195-208, 2003

Composition of needle wax in Pinus sylvestris as affected by provenance and needle age and its significance in susceptibility to Lophodermium pinastri (Schrad.)Chev. Flora 161(5/6): 604-622, 1972

Longevity of needle fascicles of Pinus longaeva (Bristlecone pine) and other North American pines. Oecologia 51(1): 107-115, 1981

Longevity of needle fascicles of pinus longaeva bristlecone pine and other north american pines. Oecologia 51(1): 107-115, 1981

Contrasting patterns of spatial genetic differentiation in two east asian five-needle pine species, Pinus koraiensis and P armandii. Annals Of Forest Research: 31-42, 2008

Chemical composition of the needle-twig oils of Pinus brutia Ten. Journal of essential oil research: JEOR- 18(4): 445-447, 2006

Chemical composition of Macedonian pine (Pinus peuce) needle oil. Glasnik Sumarskog fakulteta Serija A Sumarstvo Belgrade Univerzitet Sumarski fakultet: 4) 147-150, 1980

Eco physiological studies on young scotch pine pinus sylvestris stands 2. distribution of needle biomass and its application in approximating light conditions inside the canopy. Silva Fennica 14(3): 243-257, 1980