Hydrogen cyanamide (CY) has been used to break rest
in temperate crops, but levels used to overcome rest are
sometimes toxic to plants. The rest breaking effect of CY
is thought to involve peroxide metabolism. Inhibition of
catalase by CY has been proposed as a mechanism for
overcoming dormancy in...
The leaching of water soluble phenolic compounds from
cold stressed Rhododendron leaves was found to be a reliable
indicator of tissue damage. In sublethally stressed leaf
tissues, more and novel phenolic compounds appeared and were
hypothesized to be precursors of cell wall components such
as lignin and suberin. Subsequent radiolabeling...
A rapid and sensitive HPLC method for quantifying both the
reduced and oxidized forms of glutathione simultaneously in woody
plant tissues was developed. This method was applicable to a variety
of woody plant species and different tissues. Total glutathione
content in the bark tissue of seven of the woody plant...
Techniques to measure vegetative maturity and dormancy
of deciduous nursery stock were investigated in red-osier
dogwood. Previous methods which were based on: survival
or tip dieback, change in level of ethylene production,
xylem water potential, and alteration of square wave traces
traces, provided no better indication of dormancy than did...
The effects of overcoming rest by application of "near-lethal" (NL)
stress treatments on the subsequent development of cold hardiness of
stem tissues of red-osier dogwood, Comus sericea L., at different rest
stages under three post-environments (0°, 23°, and natural condition)
were studied. NL-heat stress (47°C for one hour) treatment during...
The relationships between nitrogen (N), defoliation, and plant growth in
nursery plants were studied using almond {Prunus dulcis (Mill) D. A. Webb) trees. In
several experiments the effects of N source and availability on tree growth, N uptake,
N remobilization, and nonstructural carbohydrates (TNC) were investigated to
determine the most...
The stage of dormancy development at which deciduous nursery
stock can be safely defoliated for harvest was investigated in red-osier
dogwood (Cornus stolonifera Michx.). This stage, previously called
"vegetative maturity," was found to correspond to the onset of winter
dormancy in red-osier dogwood. A reduction in ethylene production
by excised...
Red-osier dogwood plants were grown outdoors in a lathhouse
and under two temperature regimes in growth chambers to determine
the time of vegetative maturity, the transition between summer and
winter dormancy. Xylem water potential (XWP), tissue moisture
content, ethylene and ethane production, and electrical impedance
were used to try to...
Acclimatization of in vitro apples and plums was examined in
four studies: l) Leaf anatomy and water stress of aseptically cultured
'Pixy' plum grown under different environments, 2) Acclimatization
of aseptically cultured 'Mac 9' apples to low relative humidity,
3) Stomatal functioning of aseptically cultured 'Mac 9' apple
leaves in...