Showing papers by "Forest Research Institute published in 1969"
TL;DR: The genus Gunnera (Haloragaceae) contains forty species, all herbaceous, ten being endemic to New Zealand, with the blue-green alga Nostoc puntiforme belonging to this group.
Abstract: THE genus Gunnera (Haloragaceae) contains forty species, all herbaceous, ten being endemic to New Zealand. Glands occurring at the bases of leaves become invaded by the blue-green alga Nostoc puntiforme1,2 which becomes intracellular3 and is capable of nitrogen fixation in culture2,4. Algal glands have been described for several New Zealand species5,6.
74 citations
TL;DR: The marked altitudinal variation in tolerance to low temperatures suggested that natural selection may have operated under the influence of winter temperature gradients to bring about adaptive changes related to altitude of occurrence.
Abstract: Summary
The effects of temperature variation on germination and seedling growth in populations from different altitudes of Eucalyptus pauciflora were investigated by means of experiments in controlled environments and under natural conditions in the field.
Germination and seedling growth showed no statistically significant variation in optimum temperature according to altitude. On the other hand, there was strong evidence of differential resistance to freezing temperatures whereby seedlings from high-altitude seed proved considerably more resistant than those from low-altitude seed. This was reflected, to a certain extent, in the survival of reciprocal transplants over winter.
The relative uniformity of temperature optima suggested that in the field germination and early seedling growth would occur later with increasing altitude, thus bearing out casual field observations. The marked altitudinal variation in tolerance to low temperatures suggested that natural selection may have operated under the influence of winter temperature gradients to bring about adaptive changes related to altitude of occurrence.
36 citations
TL;DR: Possums and wallabies browse on woody species in many areas of mountain ash forest after logging and burning, and Wallabia rufogrisea var.
Abstract: SUMMARY Possums (Trichosurus vulpecula fuliginosus) and wallabies (Thylogale biliardieri) browse on woody species in many areas of mountain ash (Eucalyptus regnans F.Muell) forest after logging and burning, and Wallabia rufogrisea var. frutica also is found in some areas. The browsing is most damaging if it completely defoliates the plants in autumn. Many plants are killed. Variations between plant species in palatibility and ability to survive defoliation result in alterations in the composition of the vegetation. The satisfactory regeneration of mountain ash requires prevention of excessive browsing in the first one to two years after germination. Attempts at ecological control of browsing have been unsuccessful and direct control by poisoning or capture is carried out.
35 citations
TL;DR: Growth disorders in 3-year-old radiata pine associated with very low copper concentrations in the foliage are described in this paper, where the low concentrations of copper appear to have been nitrogen induced.
Abstract: Growth disorders in 3-year-old radiata pine associated with very low copper concentrations in the foliage are described. The low concentrations of copper appear to have been nitrogen induced. The effect of remedial measures is being investigated.
22 citations
TL;DR: It is suggested that, following pollination in vivo, the auxin may diffuse from the germinated pollen-tube onto the nucellus, thereby triggering the processes which allow ovule and gametophyte development to proceed.
Abstract: Germinated pollen of Pinus radiata contains an auxin which is active in the Avena coleoptile test. It differs from all other hormones detected in pine pollen in that it is readily able to diffuse out from the pollen into an agar medium. It is suggested that, following pollination in vivo, the auxin may diffuse from the germinated pollen-tube onto the nucellus, thereby triggering the processes which allow ovule and gametophyte development to proceed. The auxin is water-soluble and may be an indole derivative.
17 citations
TL;DR: The snow gum of south-eastern Australia, Eucalyptus pauciflora Sieb.
Abstract: Some of the taxonomic problems concerning continuous variation referred to by Bocher (1967) are exemplified in the snow gum of south-eastern Australia, Eucalyptus pauciflora Sieb. ex Spreng. A taxonomic study of this species was carried out in connection with an investigation of altitudinal variation in the Brindabella Range, near Canberra, where continuous though not pure stands occur between 4,000 and just over 6,000 feet (Green 1967). The species is here discussed over its whole range of distribution in south-eastern Australia, although special emphasis is placed on the forms considered to occur in the study area.
12 citations
TL;DR: Significant increases in wool growth rate and a significant protein level × cysteine infusion interaction were observed and the sheep fed the high-protein diet grew more wool than those fed the low- protein diet.
Abstract: New Zealand Romney wethers were infused intravenously with 2 and 4 g per day of cysteine hydrochloride Their wool growth rates were compared with those of saline-infused controls Cysteine infusion apparently counteracted the winter depression in wool growth No difference in response between 2 and 4 g per day was detected In a second experiment, New Zealand Romney wethers were fed two dietary protein levels and were infused with 2 g per day of cysteine hydrochloride Their wool growth rates were compared with saline-infused controls fed comparable levels of dietary protein Significant increases (p < 01) in wool growth rate from the cysteine-infused sheep and a significant protein level × cysteine infusion interaction were observed The sheep fed the high-protein diet grew more wool than those fed the low-protein diet
10 citations
TL;DR: It is concluded that both the LT50 and the length of the larval period are prolonged by low temperature, and nuclear polyhedrossis virus may be an effective control agent against N. sertifer in cool areas even if the LT 50 is relatively long.
Abstract: Larvae ofNeodiprion sertifer (Geoff.) were reared on twigs from Scots pine at three different temperatures, 12°C, 18°C and 24°C. The LT50 of virus-infected larvae was 19.3, 9.5 and 4,6 days respectively. In the control the median length of the larval period was 45.7, 29.8 and 22.1 days at the same temperatures. From this results it is concluded that both the LT50 and the length of the larval period are prolonged by low temperature. The medium length of the larval period, however, is relatively more prolonged than is the LT50. Therefore, nuclear polyhedrossis virus may be an effective control agent againstN. sertifer in cool areas even if the LT50 is relatively long.
7 citations
TL;DR: In this paper, a 600 m transect from the southeastern shore toward the hills of Sumatra was carried out and three main soil types were encountered, i.e., the sandy regosols, the tuffaceous over sandy regools, and the latosolized tuffery regoels over podsolized grumusols.