Effect of flower sex ratio on fruit set in pumpkin (Cucurbita maxima)

2019 ◽  
Vol 246 ◽  
pp. 1005-1008 ◽  
Author(s):  
Sinu Palatty Allesh ◽  
Sangeetha Varma ◽  
K.S. Reshmi ◽  
K. Aswathi ◽  
P.P. Megha ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Fruit Set ◽  
Cucurbita Maxima ◽  
Flower Sex Ratio

scholarly journals Assessment of weather effect on flower morphogenesis and fruit set in mango varieties in central India

2022 ◽  
Vol 24 (1) ◽  
Author(s):  
N. R. RANGARE ◽  
MANISH BHAN ◽  
S. K. PANDEY
Keyword(s):  
Sex Ratio ◽  
Minimum Temperature ◽  
Fruit Set ◽  
Male Flower ◽  
Central India ◽  
Flower Initiation ◽  
Hermaphrodite Flower ◽  
Flower Morphogenesis ◽  
Bud Initiation ◽  
Flower Sex Ratio

A two-year field experiment was initiated in 2017-18 and 2018-19 years simultaneously to assess temperature on flower morphogenesis stages, flower sex ratio (hermaphrodite/staminate male flower) and fruit set in monoembryonic Langra and Amrapali varieties. Different dates of flower phenological stages viz., bud, panicle, bloom and flower initiation, pea, marble, egg, and maturity of fruits were recorded. The Langra variety exhibited bud initiation after mid December whereas Amrapali variety by the end of December. The range of mean maximum / minimum temperature as 26-31/10-12 °C promoted hermaphrodite flowers per panicle by 74 per cent in Langra variety, whereas range of 27-29/11-13 °C favored by 35 per cent in Amrapali variety. A positive and significant correlation between total number of flower / panicle and flower sex ratio in both the varieties suggested that higher temperature during initial flower phenologies improved number of hermaphrodite flowers. A mean minimum temperature for producing more number of hermaphrodite flower  exhibited a range of 11-14 °C under central Indian conditions.  Fruit set was maximum during pea stage and decline afterwards in marble and fruit maturity stages due to sudden rise in temperature at marble stage that caused in drop down of humidity thereby resulted in fruit drop in both the varieties.

The DEVELOPMENT OF Elaeidobius kamerunicus FAUST POPULATION AFTER INTRODUCTION AND THE IMPROVEMENT OF OIL PALM FRUIT SET IN SERAM ISLAND, MOLLUCAS, INDONESIA

2016 ◽  
Vol 24 (1) ◽  
pp. 47-55
Author(s):  
Agus Eko Prasetyo ◽  
Agus Susanto
Keyword(s):  
Sex Ratio ◽  
Oil Palm ◽  
Fruit Set ◽  
Average Risk ◽  
Palm Fruit ◽  
Male And Female ◽  
Risk Of Death ◽  
North Sumatra ◽  
Female Flowers ◽  
Elaeidobius Kamerunicus

Elaeidobius kamerunicus is the main pollinating agent in oil palm plantations in Indonesia today. The development of oil palm plantations in new areas requires introduction of these insects, moreover the new areas are located on different islands. First introduction of Elaeidobius kamerunicus Faust had been done from North Sumatra to Seram Island on 23 September 2013. The introduction was performed on larva and pupa stadium in 4-5 days post anthesising of male inflorescences. The introduction of E. kamerunicus using plywood boxes has an average risk of death by 7.89% at 6 days delivery period. Observation before releasing of the weevils showed that this insect was not detected in both of oil palm male and female flowers and the oil palm fruit set was very low approximately 11.27%. For about 500 weevils/ha were released in Marnuhu estate and could be developed into 362,401 weevils/ha in 5 months with 97.86% of oil palm sex ratio. The oil palm fruit sets were increased after 1 and 2 months introduction, 53.70% and 75.56 %, respectively. The lower sex ratio of oil palm or the more availability of male inflorescences make growth of E. kamerunicus population became faster and the greater number of weevils that visiting anthesising of female flowers make the higher value of oil palm fruit set.

The DEVELOPMENT OF Elaeidobius kamerunicus FAUST POPULATION AFTER INTRODUCTION AND THE IMPROVEMENT OF OIL PALM FRUIT SET IN SERAM ISLAND, MOLLUCAS, INDONESIA

2018 ◽  
Vol 24 (1) ◽  
pp. 47-55
Author(s):  
Agus Eko Prasetyo ◽  
Agus Susanto
Keyword(s):  
Sex Ratio ◽  
Oil Palm ◽  
Fruit Set ◽  
Average Risk ◽  
Palm Fruit ◽  
Male And Female ◽  
Risk Of Death ◽  
North Sumatra ◽  
Female Flowers ◽  
Elaeidobius Kamerunicus

Elaeidobius kamerunicus is the main pollinating agent in oil palm plantations in Indonesia today. The development of oil palm plantations in new areas requires introduction of these insects, moreover the new areas are located on different islands. First introduction of Elaeidobius kamerunicus Faust had been done from North Sumatra to Seram Island on 23 September 2013. The introduction was performed on larva and pupa stadium in 4-5 days post anthesising of male inflorescences. The introduction of E. kamerunicus using plywood boxes has an average risk of death by 7.89% at 6 days delivery period. Observation before releasing of the weevils showed that this insect was not detected in both of oil palm male and female flowers and the oil palm fruit set was very low approximately 11.27%. For about 500 weevils/ha were released in Marnuhu estate and could be developed into 362,401 weevils/ha in 5 months with 97.86% of oil palm sex ratio. The oil palm fruit sets were increased after 1 and 2 months introduction, 53.70% and 75.56 %, respectively. The lower sex ratio of oil palm or the more availability of male inflorescences make growth of E. kamerunicus population became faster and the greater number of weevils that visiting anthesising of female flowers make the higher value of oil palm fruit set.

scholarly journals Florivory and sex ratio in Annona dioica St. Hil. (Annonaceae) in the Pantanal at Nhecolândia, southwestern Brazil

2006 ◽  
Vol 20 (2) ◽  
pp. 405-409 ◽  
Author(s):  
Hipólito Ferreira Paulino Neto ◽  
Reinaldo Chaves Teixeira
Keyword(s):  
Sex Ratio ◽  
Fruit Set ◽  
Flowering Plants ◽  
The Mean ◽  
Male Flowers

Annona dioica St. Hil. is a species that grows to approximately 2 m tall and is very widespread in the cerrados. Individual plants of this androdioecious species produce numerous hermaphroditic or male flowers, but few fruits. The aim of this study was to determine the sex ratio among the plants and to compare the frequency of herbivory between male and hermaphroditic flowers. The fieldwork was done by studying flowering plants in grasslands used as pasture for cattle at Fazenda Nhumirim. One hundred and forty-seven male plants and 71 hermaphroditic plants were examined and produced a total of 194 and 94 flowers, respectively, during the study period. The male:hermaphrodite sex ratio was 2.07:1, and was similar to the male:hermaphrodite flower ratio of 2.06:1. The frequency of florivory rate in hermaphrodites was significantly higher than in male flowers (33.0%, n = 31, and 25.7%, n = 50, respectively; G = 14.83; d.f. = 1; p < 0.001). The mean fresh weights of male and hermaphroditic flowers were significantly different (8.38 ± 2.40 g vs. 6.93 ± 2.68 g, respectively; 0 ± SEM; n = 50 each; t = 2.479; d.f. = 49; p = 0.017). These results indicate that the low fruit set in this species can be explained by the sex ratio, the greater herbivory of hermaphroditic flowers and the probable absence of pollinators.

Studies on flowering induction, sex ratio and fruit set improvement in pomegranate

2020 ◽  
Vol 77 (4) ◽  
pp. 610-618
Author(s):  
R. Kumar ◽  
P. L. Saroj ◽  
B. D. Sharma ◽  
P. K. Yadav
Keyword(s):  
Sex Ratio ◽  
Fruit Set ◽  
Flowering Induction

Sex ratio, flowering and fruit set in dioecious Rubus chamaemorus (Rosaceae) in Labrador

Botany ◽  
2008 ◽  
Vol 86 (2) ◽  
pp. 204-212 ◽  
Author(s):  
Amanda L. Karst ◽  
Joseph A. Antos ◽  
Geraldine A. Allen
Keyword(s):  
Sex Ratio ◽  
Fruit Set ◽  
Seed Set ◽  
Sex Ratios ◽  
Fruit Production ◽  
Habitat Characteristics ◽  
Rubus Chamaemorus ◽  
Males And Females ◽  
Unpredictable Environment ◽  
Female Flowers

Rubus chamaemorus L. is a dioecious clonal herb with highly variable fruit production. Our overall objective was to determine how fruit production (and the reproductive stages leading to fruit) for R. chamaemorus varied with habitat and population (especially sex ratio) characteristics at scales from 1 m2 quadrats to whole populations in southeastern Labrador, Canada. During the climatically favourable year studied, reproductive variables were only weakly correlated with habitat characteristics. Strongly biased sex ratios were found at scales of 1–10 m. Male-dominated quadrats exhibited a significantly higher proportion of flowering ramets than did female-dominated quadrats. Female-biased sex ratios of flowering ramets and large distances between male and female flowers were correlated with decreased seed set. We found no differences in microhabitats of males and females. Although the biased local sex ratios could limit sexual reproduction, the high fruit set we measured clearly indicates that populations are able to produce abundant fruit during favourable years in this unpredictable environment.

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