Forest Research Institute

About: Forest Research Institute is a facility organization based out in Dehra Dūn, India. It is known for research contribution in the topics: Population & Forest management. The organization has 5320 authors who have published 7625 publications receiving 185876 citations.

Dehardening of mountain birch (Betula pubescens ssp. czerepanovii) ecotypes at elevated winter temperatures

Abstract: Summary • The aim was to elucidate the effects of elevated winter temperatures on the dehardening process of mountain birch (Betula pubescens ssp. czerepanovii) ecotypes and to evaluate their susceptibility to frost damage under warming climate conditions. • Ecotypes from 60 to 71° N latitudes and 20–750 m altitudes were grown in northern Norway (70° N) and subjected to simulation of the photoperiod in southern Norway (60° N) by artificial illumination from September onwards. In November, the seedlings were transported to the south (60° N) to overwinter at ambient or 4°C above ambient temperatures. Frost hardiness and lipid peroxidation were determined during January–April. • The higher winter temperature accelerated dehardening, and there were significant differences between the ecotypes. Among tree individuals of southern origin, the alpine ecotype exhibited the most rapid rate of dehardening, whereas the oceanic type showed the slowest rate. Lipid peroxidation supported the above findings. • Since temperature elevation was unequal for the ecotypes with respect to climatic change, the frost hardiness results were normalized to obtain an equal +4°C temperature rise. The risk of frost injury seemed to be lowest in the northernmost ecotypes under a temperature elevation of +4°C, obviously due to their adaptation to a wider temperature range.

Molecular identification and phylogeny of Armillaria isolates from South America and Indo-Malaysia.

Abstract: Armillaria root rot is a serious disease, chiefly of woody plants, caused by many species of Armillaria that occur in temperate, tropical and sub- tropical regions of the world. Very little is known about Armillaria in South America and Southeast Asia, although Armillaria root rot is well known in these areas. In this study, we consider previously un- identified isolates collected from trees with symptoms of Armillaria root rot in Chile, Indonesia and Malay- sia. In addition, isolates from basidiocarps resembling A. novae-zelandiae and A. limonea, originating from Chile and Argentina, respectively, were included in this study because their true identity has been uncer- tain. All isolates in this study were compared, based on their similarity in ITS sequences with previously sequenced Armillaria species, and their phylogenetic relationship with species from the Southern Hemi- sphere was considered. ITS sequence data for Armil- laria also were compared with those available at GenBank. Parsimony and distance analyses were con- ducted to determine the phylogenetic relationships between the unknown isolates and the species that showed high ITS sequence similarity. In addition, IGS-1 sequence data were obtained for some of the species to validate the trees obtained from the ITS data set. Results of this study showed that the ITS sequences of the isolates obtained from basidiocarps

Genetic analysis of inbreeding depression in plus tree 850.55 of Pinus radiata D. Don. I. Genetic map with distorted markers

Abstract: A genetic map of Pinus radiata plus tree 850.55 was constructed using megagametophytes of S1 seeds. The map contained 19 linkage groups, with 168 RAPD and four microsatellite markers. The total map length was 1116.7 cM (Kosambi’s function) and was estimated to cover 56% of the genome. Of the 172 markers, 59 (34%) were distorted from the expected 1 : 1 ratio in megagametophytes (P<0.05). We show that if the distortion is caused by a single viability gene or by sampling error, the estimate of recombination frequency in megagametophytes of selfed seeds would not be affected.