scholarly journals Phenology of Sclerocarya birrea (A. Rich.) Hochst. Provenances

2019 ◽  
Vol 3 (1) ◽  
pp. 10
Author(s):  
V. J. Msukwa ◽  
C. R. Y. Munthali ◽  
B. I. Nyoka ◽  
E. Missanjo
Keyword(s):  
Fruit Set ◽  
Fruit Yield ◽  
Early Flowering ◽  
Flower Opening ◽  
Late Flowering ◽  
Sclerocarya Birrea ◽  
Bud Set ◽  
Fruit Maturity ◽  
Maturity Period ◽  
Leaf Flush

Phenology study was conducted to assess 22 genotypes of Sclerocarya birrea (A. Rich.) Hochst, collected from West, Eastern and Southern Africa. Assessments were done on time for bud onset, flower opening, leaf flush, fruit set, fruit maturity period and fruit production.  Highly significant (P< 0.001) variations between provenances were obtained in all the phenological traits assessed including variations between sexes in time from flower bud set to anthesis. There was flowering overlaps and synchrony between provenances and sexes with males flowering earlier than females. So far two subpopulations have emerged within the trial referred to as early and late flowering genotypes. The early flowering included provenances from Mozambique, and Swaziland while the late flowering encompassed provenances from Malawi, Zimbabwe, Namibia, Tanzania and Zambia. Fruit maturity period ranged from 76±2 to 192±15days. The early flowering genotypes flowered, fruited and matured between August and January while the late genotypes flowered and fruited from September to May. There were highly significant (P≤0.001) variations in fruit yield of S. birrea provenances between 2016/2017 and 2017/2018 seasons with the former being more productive than the later confirming that S. birrea fruit yield is not constant across seasons due to seed mating effects. There were very strong positive relationship ranging r=0.81 to r=0.78 between leaf flush, bud set, flower opening and fruit set significant at (P<0.001). Some trees classified as females in the first year as based on flowers were found have male flowers which calls for more detailed investigations into this sex change behaviour.

scholarly journals Performance of Exotic Sweet Orange Genotypes at Dhankuta, Nepal

2018 ◽  
Vol 6 (4) ◽  
pp. 308-312
Author(s):  
Amar Bahadur Pun ◽  
Manish Kumar Thakur
Keyword(s):  
Sweet Orange ◽  
Fruit Size ◽  
Fruit Yield ◽  
Excellent Performance ◽  
Yield And Quality ◽  
Washington Navel ◽  
Fruit Maturity ◽  
Maturity Period ◽  
Superior Genotypes ◽  
Local Genotypes

The study was conducted to evaluate the varietal performance of sweet orange genotypes at National Citrus Research Program, Dhankuta, Nepal during 2015. Twenty 20 exotic as well as local genotypes planted in 2005 were evaluated for their fruit physio-chemical characteristics at their 10-years aged. Three genotypes: Malta Blood Red, Dhankuta Local and Valencia Late have resulted as superior genotypes for fruit yield characteristics. Some genotypes Delicious Seedless, Salustiana and Hamlin also exhibited excellent performance for their fruit size and weight; however these genotypes produced lower fruit number per plant. Pineapple, Meisheu-9, and Washington Navel had higher TSS. There was similar fruit maturity period commenced from 14 November to 28 December among the genotypes. Based on the results, the genotypes showing distinct characteristics of fruit yield and quality including fruit maturity period should be promoted to make variety diversity in Nepal. Int. J. Appl. Sci. Biotechnol. Vol 6(4): 308-312

scholarly journals DELAYING BLOOM OF `LORING' PEACH BY FALL APPLICATION OF GIBBERELLIC ACID, ETHEPHON, AND GIBBERELLIC ACID PLUS ETHEPHON

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 735b-735
Author(s):  
A. Caylor ◽  
W. Dozier ◽  
D. Himelrick ◽  
J. Pitts ◽  
L. Chapman
Keyword(s):  
Gibberellic Acid ◽  
Fruit Set ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Flower Bud ◽  
Fruit Maturity ◽  
Peach Trees ◽  
Fall Application

Four year old `Loring' peach trees on `Lovell' rootstock were treated with single applications of 0, 50, and 100 ppm GA3 alone and in combination with 100 ppm ethephon on 15 November 1988, 1989, and 1990 to determine the effect on bloom delay the following spring. Flower bud number was not affected by any of the treatments the next spring. Ethephon had the greatest effect on bloom delay the following spring. The 50 and 100 ppm GA3 treatments resulted in a slight delay of bloom. The combination of 50 and 100 ppm GA3 and 100 ppm ethephon resulted in less of a bloom delay than ethephon alone but greater than the GA3 treatments alone. Fruit set was increased by ethephon treatments in 1989 and 1991 but not in 1990. Ethephon treatments delayed fruit maturity whereas GA3 did not. Total fruit yield for 1989, 1991, and the three year average was not effected by treatments. However, in 1990 50 ppm GA3 resulted in the highest yields. Ethephon treatments reduced the average fruit weight in 1990 and 1991 but not in 1989 or the three year average.

scholarly journals Genetic divergence in bitter gourd (Momordica charntia L.)

2013 ◽  
Vol 38 (2) ◽  
pp. 125-134
Author(s):  
BC Kundu ◽  
MM Hossain ◽  
MA Khaleque Mian ◽  
IH Mian
Keyword(s):  
Genetic Divergence ◽  
Seed Weight ◽  
Male Flower ◽  
Bitter Gourd ◽  
Flower Opening ◽  
Green Fruit ◽  
Fruit Maturity ◽  
Cluster Distance ◽  
Geographical Position ◽  
Seed Width

The genetic divergence among 36 genotypes of bitter gourd (Momordica charantia L.) was determined through PCA, PCO, CVA, Cluster analysis (CLSA) and Mohalanobis’s D2 analysis. Through multivariate analysis based on 22 characters 36 genotypes were grouped into six distant clusters. Cluster VI includes maximum genotypes (12) followed by cluster I (6) and cluster II (6). Cluster V, cluster III and cluster I comprised 5, 4 and 3 genotypes respectively. The inter-cluster distances were higher than the intra-cluster distances. The inter-cluster distance was maximum between cluster III and IV (28.71) followed by the distance between cluster I and cluster IV (23.61). The intra-cluster distances in all the 6 clusters were more or less low indicating the closeness of genotypes within the same cluster. The highest intra-cluster distance was observed for cluster III (1.84) followed by the cluster I (1.38). The genotypes within the same clusters were collected from different places and genotypes collected in the same place fall in different cluster, which indicated that genetic divergence are not dependent on its geographical position from where the genotypes were collected. The genetic diversity of 36 genotypes was also assessed through PCA. The first three components accounted for 60.04% of the total variation. Days to first male flower opening, number of primary branches per vine, fruit yield per vine, days to green fruit maturity, seed weight per fruit mature seed width had the highest contribution towards the divergence. Cluster diagram exhibited that the genotypes include in the cluster III were far diverse from the genotypes of cluster IV while the genotypes belonging to the cluster II and VI were least diversed. DOI: http://dx.doi.org/10.3329/jasbs.v38i2.15593 J. Asiat. Soc. Bangladesh, Sci. 38(2): 125-134, December 2012 J. Asiat. Soc. Bangladesh, Sci. 38(2): 125-134, December 2012

scholarly journals Time of flowering and fertilisation of quince varieties

1999 ◽  
Vol 5 (1-2) ◽  
Author(s):  
T. Szabó ◽  
J. Nyéki ◽  
M. Soltész ◽  
Z. Szabó ◽  
T. Tóth
Keyword(s):  
Fruit Set ◽  
Fruit Size ◽  
Late Flowering ◽  
Cross Pollination ◽  
Self Pollination ◽  
The Individual ◽  
Contradictory Data

Literature dealing with flowering and fertilisation of quince is scarce. Most controversial and scanty are informations on observations of self- and cross-pollination. According to our observations, differences in blooming time are few (2-3) days only, thus flowering of most varieties is synchronous. The varieties observed are grouped as early, intermediate and late flowering ones. Self fertility of the individual varieties, however, was not assessed unequivocally, therefore it is recommended, by safety reasons, to consider quince actually as a whole to be auto-incompatible. Artificial self-pollination (or rather geitonogamy) as well as cross pollination with other varieties increased substantially fruit set if compared with the results of natural self-pollination (autogamy). According to the fruit set of their open pollinated flowers, varieties have been classified according to fertility as low (below 10 %), medium (between 10 and 20 %) and high (more than 20 %). Cross fertility of varieties is highly variable depending on combination and on season. Contradictory data are probably due to the sensitivity of quince to conditions of search. Better fruit set was coincident with higher number of stout seeds per fruit. Well developed seeds are definitely a prerequisite of larger fruit size.  

scholarly journals Formation of the Astilbe Buch.-Ham collection in a continental climate

2021 ◽  
Vol 10 (3) ◽  
pp. 34-40
Author(s):  
Olga Yurievna Vasilyeva
Keyword(s):  
Western Siberia ◽  
Landscape Design ◽  
Early Flowering ◽  
Forest Steppe ◽  
Middle Zone ◽  
Heat Gain ◽  
Late Flowering ◽  
June July ◽  
Intense Heat ◽  
Continental Climate

The paper analyzes the dynamics of formation of a collection of Astilbe varieties and species included in the bioresource collection USU 44053 in the conditions of Western Siberia forest-steppe. The ways of further expansion of Astilbe collection fund are substantiated by attracting representatives of the Astilbe chinensis , A. crispa groups; varieties with rhombic, narrow-lobed and pyramidal inflorescences, primarily belonging to the group of colors: red, dark red, purple and dark purple. In contrast to the conditions of the middle zone of Russia in which Astilbe are divided into four groups according to the period of flowering: 1) very early (end of June - July), 2) early (July), 3) medium (mid-July - mid-August) and 4) late (end of August - mid-September), for the conditions of Western Siberia forest-steppe, with intense heat gain in mid-May-early June, the flowering dates of very early and early varieties converge. Accordingly, there are three groups: early-flowering (bloom July 8-10), medium-flowering (bloom from July 15-18), late-flowering (bloom from late July-early August). It is proposed to add a narrow-lobed and pyramidal-drooping inflorescence to the traditionally described forms of Astilbe varieties. The expansion of the set of dwarf varieties from the A. crispa group with strongly dissected fringed leaves gives additional opportunities for a landscape design.

scholarly journals Influence of unstable weather conditions on the passage time of phenological phases of black currant in the Middle Urals

2020 ◽  
Vol 198 (7) ◽  
pp. 23-28
Author(s):  
Elena Chebotok
Keyword(s):  
Weather Conditions ◽  
Passage Time ◽  
Early Flowering ◽  
Practical Significance ◽  
Middle Urals ◽  
Black Currant ◽  
The Middle Urals ◽  
Late Flowering ◽  
Early Maturation ◽  
Phenological Phases

Abstract. Purpose. The research is aimed at studying the influence of weather conditions on the timing of the phenological phases of black currant in the Middle Urals. Methods. The study is based on methods of phenological observations in accordance with generally accepted methods. Results and practical significance. It was found that black currant adapts well to unstable weather conditions in recent years in the Middle Urals, during the research period, budding was observed in the period from April 12 to May 4; the dates of the beginning of flowering were marked from May 10 to May 28; maturation dates are marked from July 16 to August 10. The shift in the dates of onset of the main phases of vegetation from the average long-term can reach 14 days. Industrial plantings should consist of varieties of different flowering and maturation periods, to avoid the spring frosts of the main part of the plantation, as well as to form a conveyor for the arrival of fresh berries. The experiment identified five early-flowering cultivars in the Middle Urals: Zabava, Fortuna, 1-3-010-13, 3-2-010-13, 6-44-00-03; four late-flowering: Gerkules, Slavyanka, 5-1-010-13, 8-2-010-13; the remaining 28 cultivars are of the average flowering period. Five varieties of early maturation are identified: Zabava, 2-1-010-13, 2-4-010-13, 3-1-010-13, 5-1-010-15; four late maturation: Zaglyaden’e, Kipiana, Chudnoe mgnovenie, Slavyanka; the remaining 28 varieties are of average maturation. Not all early-flowering cultivars are early-maturing, and not all late-flowering cultivars are late-maturing. The scientific novelty consists in the study of phenological rhythms of black currant varieties of various genetic origin in unstable weather conditions of recent years in the Middle Urals.

Polymorphism for vernalization requirement in a population of Avena fatua

1986 ◽  
Vol 64 (4) ◽  
pp. 730-733 ◽  
Author(s):  
H. Darmency ◽  
C. Aujas
Keyword(s):  
Avena Fatua ◽  
Early Flowering ◽  
Vernalization Requirement ◽  
Late Flowering ◽  
Type Formula ◽  
Winter Type ◽  
Beneficial Effects ◽  
Wild Oats ◽  
Spring Type ◽  
Germinating Seeds

Polymorphism for vernalization requirement has been observed within a population of wild oats, Avena fatua L., grown under greenhouse conditions. One group of plants was early flowering ("spring type," [Formula: see text]), whereas another was late flowering ("winter type," [Formula: see text]). Vernalization of the winter type was obtained by germinating seeds for 2 weeks at 4 °C and resulted in shortening the time to heading by 50 days. However, this polymorphism was not observed in the field when plants germinated before mid-May. Hence, vernalization requirements did not appear to have any adverse or beneficial effects on time to heading and may be a neutral character in this population. Nevertheless, the frequency of the winter type in the population increased significantly over 6 years. Mechanisms are suggested to account for this phenomenon.

scholarly journals Selection Criteria for Improving Yield in Chili (Capsicum annuum)

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
S. Chakrabarty ◽  
A. K. M. Aminul Islam
Keyword(s):  
Direct Effect ◽  
Coefficient Of Variation ◽  
Seed Weight ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Edible Fruit ◽  
Fruit Maturity ◽  
Positive Direct ◽  
Dry Fruit ◽  
Weight Number

The present investigation was carried out to estimate the genetic variability and character association. Significant differences were observed among the genotypes for all the 15 traits for 20 chili genotypes. The highest genotypic coefficient of variation and phenotypic coefficient of variation were found for ten edible fruit weight, number of fruits per plant, fruit yield per plant, ten dry fruit weight, fruit length, fruit width, and weight of seeds per fruit. High heritability coupled with very high genetic advance as per cent of mean was observed for ten edible fruit weight, ten dry fruit weight, fruit length, number of fruits per plant, and fruit yield per plant. Phenotypic correlation coefficient among different traits indicated that fruit yield per plant at green stage had significant and positive association with ten edible green fruit weight, number of primary branches, harvest duration, and first fruit maturity and significant negative correlation with days to first picking. The path coefficient analysis revealed that days to first picking had the maximum positive direct effect on fruit yield per plant followed by harvest duration, ten edible fruit weight, ten dry fruit weight, hundred-seed weight, number of fruits per plant, first fruit maturity, and number of primary branches. Days to first picking had the maximum positive direct effect but significant negative effect with fruit yield per plant which indicated that the trait should be selected to expunge the undesirable indirect effect in order to make use of the direct effect. Therefore, selection should be practiced for ten edible fruit weight, ten dry fruit weight, number of fruits per plant, harvest duration, and hundred-seed weight for direct improvement of fruit yield per plant.

Crop regulation in guava-A review

2016 ◽  
Vol 37 (1) ◽  
Author(s):  
Rajbir Singh Boora ◽  
H. S. Dhaliwal ◽  
N. K. Arora
Keyword(s):  
Basic Principle ◽  
Vegetative Growth ◽  
Rainy Season ◽  
Fruit Set ◽  
Winter Season ◽  
Fruit Yield ◽  
Recommended Dose ◽  
Terminal Portion ◽  
Lateral Bud ◽  
Yield Quality

The basic principle of crop regulation is to manipulates the natural flowering and fruiting of guava plant in desired season of the year that contribute to increased fruit yield, quality, profitability and sustainability of the environment by reducing the use of the frequency of the pesticides. This concept is based on the fact that guava flowers are borne only on new, succulent, vigorously emerging vegetative growths. These new growth flushes can be either new emergences of lateral bud on older stems or extensions of already established terminals of various size and vigor. The crop regulation can be achieved by the adoption of the various practices like withholding irrigation after harvesting during the months of April-May in Northern Indian plains. This results in the shedding of flowers and the tree goes to rest. The basin of the tree is dug up, manured and irrigated in June. After about 30-35 days the tree put forth profuse flowering and fruit mature in winter. Terminal portion of the shoots up to 20 or 30 cm length should be pruned between 20<sup>th</sup> to 30<sup>th</sup> April. Always avoid severe pruning in guava. Apply the recommended dose of fertilizers during the month of June to encourage vegetative growth in July-August for getting maximum flowering during August-September for winter season crop. To regulate the guava crop, it is essential to reduce the fruit set during the rainy season and subsequently increase the fruit set during winter season by the use of different chemicals like NAA ethereal and urea etc.

Sign in / Sign up

Export Citation Format

Share Document