scholarly journals Factors influencing flower bud formation on the pear tree cultivar 'Doyenne du Comice'. I. Shoot growth and flower bud differentiation on trees sprayed with chlormequat and unsprayed ones

2013 ◽  
Vol 36 (1-2) ◽  
pp. 83-94 ◽  
Author(s):  
Franciszka Jaumień
Keyword(s):  
Shoot Growth ◽  
Apple Tree ◽  
Flower Buds ◽  
Flower Bud ◽  
Bud Formation ◽  
Pear Tree ◽  
Factors Influencing ◽  
Long Shoots ◽  
Flower Bud Differentiation ◽  
Flower Bud Formation

The growth of trees sprayed in spring with chlormequat is weaker, and their elongation growth ends 2 - 3 weeks earlier than that of unsprayed trees. Trees with growth inhibited by chlormequat set flower buds on the spurs and in the subapical part of long shoots. The course of flower bud differentiation starts in the second half of July and is similar to that in the apple tree.

scholarly journals Factors influencing flower bud formation on the pear tree cultivar 'Doyenne du Comice'. III. Saccharides, nitrogen compounds and some mineral elements contents in pear leaves and shoots

2013 ◽  
Vol 36 (1-2) ◽  
pp. 103-133
Author(s):  
Franciszka Jaumień
Keyword(s):  
Mineral Elements ◽  
Starch Accumulation ◽  
Nitrogen Compounds ◽  
Flower Buds ◽  
Flower Bud ◽  
Pear Tree ◽  
Iron And Zinc ◽  
Long Shoots ◽  
Flower Bud Formation ◽  
High Level

Long shoots inhibited in growth by treatment with chlormequate contained more reducing sugars in mid July than did the control ones growing vigorously. Storage starch accumulation was earlier in the former shoots than in he control ones, and they also contained more nitrogen compounds, especially protein, and significantly more calcium, magnesium, iron and zinc then the controls. Comparison of long shoots with growth partly inhibited by the action of chlormequate, on which flower buds form in the subapical part, and of spurs on which an apical flower bud forms, with the long shoots of control vigorously growing trees where flower buds do not form, indicates that initiation of flowering in the pear tree is associated with a high level of storage compounds, both organic and inorganic, in the stem.

scholarly journals Factors influencing flower bud formation on the pear tree cultivar 'Doyenne du Cornice'. II. Influence of growth inhibition on the anatomical structure of the stem

2013 ◽  
Vol 36 (1-2) ◽  
pp. 95-101 ◽  
Author(s):  
Franciszka Jaumień
Keyword(s):  
Growth Inhibition ◽  
Secondary Xylem ◽  
Anatomical Structure ◽  
Elongation Growth ◽  
Flower Bud ◽  
Bud Formation ◽  
Pear Tree ◽  
Factors Influencing ◽  
Flower Bud Formation

Differentiation of the particular tissues in shoots inhibited in growth by chlormequat occurs differently than in vigorously growing ones. After the end of elongation growth, in the subapical part of shoots sprayed with chlormequat the cortex extends and secondary xylem develops less intensively, this leading to an increased participation of parenchymatous tissue in the stem.

scholarly journals Timing and Severity of Summer Pruning Affects Flower Initiation and Shoot Regrowth in Sweet Cherry

HortScience ◽  
1998 ◽  
Vol 33 (4) ◽  
pp. 647-649 ◽  
Author(s):  
Charlotte M. Guimond ◽  
Gregory A. Lang ◽  
Preston K. Andrews
Keyword(s):  
Shoot Growth ◽  
Sweet Cherry ◽  
Flower Initiation ◽  
Flower Buds ◽  
Flower Bud ◽  
Lateral Shoot ◽  
Current Season ◽  
Bud Formation ◽  
Lateral Shoots ◽  
Flower Bud Formation

To examine the effect of timing and severity of summer pruning on flower bud initiation and vegetative growth, 4-year-old `Bing' cherry trees (Prunus avium L.) were pruned at 31, 34, 37, 38, or 45 days after full bloom (DAFB) with heading cuts 20 cm from the base of current-season lateral shoot growth, or at 38 DAFB by heading current-season lateral shoot growth at 15, 20, 25, or 30 cm from the base of the shoot. The influence of heading cut position between nodes also was examined by cutting at a point (≈20 cm from the shoot base) just above or below a node, or in the middle of an internode. Summer pruning influenced the number of both flower buds and lateral shoots subsequently formed on the shoots. All of the timings and pruning lengths significantly increased the number of both flower buds and lateral shoots, but differences between pruning times were not significant. There was significantly less regrowth when shoots were pruned just below a node or in the center of an internode, rather than just above a node, suggesting that the length of the remaining stub may inhibit regrowth somewhat. The coefficient of determination (r2) between flower bud number and regrowth ranged from -0.34 to -0.45. In young high-density sweet cherry plantings, summer pruning may be useful for increasing flower bud formation on current-season shoots. The time of pruning, length of the shoots after pruning, and location of the pruning cut can influence subsequent flower bud formation and vegetative regrowth.

SHOOT GROWTH AND FLOWER BUD FORMATION IN YOUNG LOQUAT TREES GROWN IN SUNLIGHT GREENHOUSE IN NORTH CHINA

2007 ◽  
pp. 407-412
Author(s):  
Q.J. Wang ◽  
J.B. Jiang ◽  
D.X. Jia ◽  
Y.H. Hu ◽  
F. Qu ◽  
...  
Keyword(s):  
Shoot Growth ◽  
North China ◽  
Flower Bud ◽  
Bud Formation ◽  
Flower Bud Formation

Effects of nitrogen addition on the population dynamics and flowering of Pulsatilla vernalis

1993 ◽  
Vol 71 (5) ◽  
pp. 732-736 ◽  
Author(s):  
Olle Kellner
Keyword(s):  
Population Dynamics ◽  
Key Words ◽  
Nitrogen Addition ◽  
Permanent Plots ◽  
Flower Buds ◽  
Flower Bud ◽  
Bud Formation ◽  
Single Fertilization ◽  
Flower Bud Formation ◽  
And Control

A population of Pulsatilla vernalis (L.) Mill, was studied in permanent plots for 8 years. Half the plots were fertilized with ammonium nitrate (15 g N/m2) at the start of the study. Mortality and natality in the ramet population were very low in both fertilized and control treatments. In contrast, there was a considerable between-year turnover of shoots within ramets in both treatments. The number of shoots increased threefold after fertilization and then gradually decreased to the original level. Flower-bud formation in unfertilized plots was lower in warm and dry years than in cooler, wetter ones. In fertilized plots, flower-bud formation was higher after fertilization irrespective of the climate at the time. The proportion of flower buds grazed was higher in fertilized plots. Even though the species is confined to nitrogen-poor habitats, a single fertilization did not adversely affect its performance. Key words: Pulsatilla vernalis, population dynamics, nitrogen, weather, forestry.

scholarly journals Effects of carbon, nitrogen, phosphorus, and potassium on flowering and Fruiting of Glycyrrhiza uralensis

2021 ◽  
Author(s):  
Binbin Yan ◽  
Yan Zhang ◽  
Xiaobo Zhang ◽  
Sheng Wang ◽  
Jie Cui ◽  
...  
Keyword(s):  
Flowering Plants ◽  
Glycyrrhiza Uralensis ◽  
Seed Setting ◽  
Flower Bud ◽  
Bud Formation ◽  
Seed Filling ◽  
N Level ◽  
Filling Stage ◽  
Flower Bud Differentiation ◽  
Flower Bud Formation

AbstractCarbon (C), nitrogen (N), phosphorus (P), and potassium (K) play an important role in flower bud differentiation and seed-filling; however, the effects of these elements on the flowering and fruiting of Glycyrrhiza uralensis Fisch. are not known. In this study, we evaluated the differences in the C, N, P, and K levels between the fruiting and nonfruiting plants of G. uralensis at different growth stages. The correlations between the elements C, N, P, and K and the flower and fruit falling rates, rate of empty seeds, rate of shrunken grains, and thousand kernel weight (TKW) were also determined. The results show that the P and K levels and C:N, P:N, and K:N ratios of flowering plants are significantly higher than those of nonflowering plants; N level of flowering plants is significantly lower than that of nonflowering plants at the flower bud differentiation stage. The number of inflorescences was positively correlated with C and K levels and C:N and K:N ratios. A low level of C, P, and K and high level of N in flowering and pod setting stage may lead to the flower and fruit drop of G. uralensis. The K level is significantly negatively correlated with the rates of empty and shrunken seeds. The N level is significantly positively correlated with TKW. Thus, high levels of C, P, and K might be beneficial to flower bud differentiation, while higher levels of N is not beneficial to the flower bud formation of G. uralensis. Higher levels of N and K at the filling stage were beneficial to the seed setting and seed-filling of G. uralensis.HighlightHigh levels of C, P, and K might be beneficial to flower bud differentiation, while higher levels of N is not beneficial to the flower bud formation of G. uralensis. Higher levels of N and K at the filling stage were beneficial to the seed setting and seed-filling of G. uralensis.

THE EFFECTS OF PHOTOPERIOD, TEMPERATURE, AND LIGHT INTENSITY ON THE GROWTH OF THE LOWBUSH BLUEBERRY (VACCINIUM ANGUSTIFOLIUM AIT.)

1961 ◽  
Vol 39 (7) ◽  
pp. 1733-1739 ◽  
Author(s):  
I. V. Hall ◽  
R. A. Ludwig
Keyword(s):  
Environmental Factors ◽  
Vegetative Growth ◽  
Photoperiodic Response ◽  
Day Length ◽  
Flower Buds ◽  
Flower Bud ◽  
Bud Formation ◽  
Lowbush Blueberry ◽  
Flower Bud Formation ◽  
Field And Laboratory Conditions

A study of the effect of environmental factors on the growth and development of the lowbush blueberry was carried out using clonally propagated plants. In a preliminary study a definite photoperiodic response was found. Under 8-hour days flower buds were formed and no vegetative growth occurred. Under 16-hour days vegetative growth resulted and no flower bud formation occurred. In a replicated greenhouse experiment, seven clones produced flower buds with 8-, 10-, and 12-hour days, but produced none with 14- or 16-hour days. One clone produced flower buds with 8-, 10,- 12-, and 14-, but none with 16-hour days. Two clones were able to produce flower buds under all five photoperiods. Under 8- and 10- hour photoperiods no vegetative growth occurred. Under 12, 14, and 16 hours progressively more vegetative growth occurred. In an experiment on the interaction of temperature and photoperiod, vegetative growth was significantly greater at 70° F than at 50° F with the differences being accentuated by day length. Flower bud formation occurred with 11- and 13-hour photoperiods regardless of temperature, but was more pronounced at the higher temperatures. At 70° F, 15-hour photoperiod, no flower buds were formed while at 50° F, 15 hours, three clones produced no flower buds and six clones produced an abnormal type of inflorescence. Similar abnormal inflorescences were produced by giving plants 2, 3, or 4 weeks of 8-hour days. Six weeks of 8-hour days was sufficient to initiate normal inflorescences. Shade, provided by two layers of cheesecloth, significantly reduced the number of flower buds compared with full sunlight. The growth of the lowbush blueberry under field and laboratory conditions is discussed in relation to environmental factors.

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