A series of methods and techniques were studied about shoot tip culture, bulb forming and dormancy breaking in vitro, scale cutting and commercial bulb production in Oriental Hybrid Lilium ( 'Sorboune' 、 'Acapulco' and 'Siberia' ).
sophia seeds indicate that D. sophia can quickly break their dormancies after being soaked in chemicals; the effect of soaking in 30 % H O for 30 minutes is the most significant and the dormancy breaking rate can reach as high as 93 %;
3 In flower buds, the maximal value of soluble sugar contents with 20'C and 15 treatments appeared earlier than that with CK, which caused that 20 and 15 treatments could break dormancy of flower bud earlier. The result showed that the appearance of maximality of soluble sugar content was the sign of dormancy breaking.
The dormancy of 90% seed can be broken in chilly (0-5℃) and warm (15-25℃) treatments of stratification. The seed coat retards 60% of the seed germinating after the seed dormancy breaking.
Autumn nitrogen treatment influenced the hormone content in stick of apricot grown in plastic greenhouse before blooming, ABA and GA were important during the course of dormancy breaking in apricot, the urea treatment of 3% and 5% influenced the hormone content in stick which was beneficial to dormancy breaking and bud developing.
Electrophoresis analysis oftotal protein revealed that two different molecular weightpolypeptide bands were found from dormancy breaking tubers. Thesynthesis of these two polypeptides were blocked byCycloheximide.
The highestactivities of RNA and DNA synthesis in the flower buds of both cultivarswere shown at dormancy breaking,the activities were relatively low atdormancy and bursting.
The characteristics of seed dormancy,dormancy breaking and germination in halophytes are discussed. The main contents are as follows:(1)The seed dormancy types of halophytes;
During storage at 23°C only the uptake of [U-14C]sucrose increased concomitant with tuber sprouting, indicating a possible involvement of the transport mechanisms in dormancy breaking.
A maximum of 85.6% of germination was obtained when isolated embryos were cultured in vitro, a result similar to those reported in the literature with traditional dormancy breaking treatments.
In vitro culture establishment, shoot proliferation, ex vitro rooting and dormancy breaking of the newly rooted plantlets were examined on Saskatoon berry (Amelanchier alnifolia NUTT.) cultivars Northline, Pembina, Smoky and Thiessen.
Seed dormancy of wood plants occurs in nature widespreadly, but its types is various and complex.I have Collected research materials for seed dormancy in fifty families, one hundred and a half species in the paper, dealt with a variety of forms and broken ways of seed dormancy. The methods of dormancy breaking were used as follows: stratification, scarification, leaching, using of light and germination stimulators, such as gibbillins, cytokinins, potassium nitrate, organic solv...
The study shows that the seed of Sassafras tzumu has double dormancy. High concentrated germination inhibitor is the main cause and the impermeability of the seed coat to gases is the other. The dormancy of 90% seed can be broken in chilly (0-5℃) and warm (15-25℃) treatments of stratification. The seed coat retards 60% of the seed germinating after the seed dormancy breaking.
The contents of RNA and DNA in the flower buds of two apple cul-tivars(Malus pumila Mill.cv.Ralls and cv.White winter pearmain)weremaintained at very low levels during dormancy,the contents increased se-veral times in bursting.There existed the activities of acid RNase(pH_5.0),alkaline RNase(pH7.5)and DNase in the flower buds and their activitiesincreased markedly during the development of flower buds.The highestactivities of RNA and DNA synthesis in the flower buds of both cultivarswere shown at d...
国光和青香蕉苹果花芽 RNA 和 DNA 含量在越冬休眠期一直处于低水平,花芽绽开时其含量增加了几倍.花芽中有酸性和碱性 RNA 酶及 DNA 酶活性,萌发时活性大大提高.RNA 和 DNA 合成活性在生理休眠解除时最高,花芽休眠和绽开时都较低.