We have previously analysed expressed sequence tags (ESTs) from non-acclimated (NA) and cold-acclimated (CA) Rhododendron leaves, and identified highly abundant complementary DNAs (cDNAs) possibly involved in cold acclimation. A potentially significant, but relatively unexplored, application of these EST data sets is the study of moderately abundant cDNAs, such as those picked only 1-3 times fr...

The natural hybridization that occurs between two sympatric species of Rhododendron subgenus Hymenanthes in Yunnan, China, was investigated. In field observations, it was noted that the putative hybrids between Rhododendron delavayi (Franch.) and Rhododendron cyanocarpum (Franch.) W.W.Smith had intermediate morphologies. On the basis of morphology, chloroplast DNA (trnL-rpl32) and nuclear DNA (...

The biological control is an alternative measure to agrochemicals to control fungal pathogens in agricultural production. We recently reported the utilization of an actinomycete to the biological control in horticultural plant. Tissue-cultured seedlings of horticultural rhododendron suffer from significant damage caused by Pestalotiopsis sydowiana, a major pathogen of rhododendron, during the a...

Rosebay rhododendron (Rhododendron maximum L.) is an ericaceous shrub commonly found in riparian areas of the Appalachian Mountains. After more than a century of fire exclusion in the U.S., the distribution of R. maximum and its dominance of forest understories have increased. Rhododendron expansion has caused a decline in overstory tree regeneration and the potential for dangerous fuel conditi...

Reliance on carbohydrates during flower forcing was investigated in one early and one late flowering cultivar of azalea (Rhododendron simsii hybrids). Carbohydrate accumulation, invertase activity, and expression of a purported sucrose synthase gene (RsSUS) was monitored during flower forcing under suboptimal (natural) and optimal (supplemental light) light conditions, after a cold treatment (7...

The isolation and detection of flavonoids in the extract Daruju root has been carried out. obtained from maceration modification using 96% ethanol, ethanol extraction result is concentrated with a rotary evaporator then evaporated above water bath until thick obtained. resulting was further separated separating funnel diethyl ether n-butanol as solvents. Then tested for plavonoid preliminaries ...

Leaf water potentials were estimated from the sum of the balancing pressure measured with a pressure chamber and the osmotic potential of the xylem sap in leafy shoots or leaves. When leaf water potentials in yew, rhododendron, and sunflower were compared with those measured with a thermocouple psychrometer known to indicate accurate values of leaf water potential, determinations were within +/...