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Vincent, Linta
- Correlation of Leaf Parameters with Incidence of Papaya Ring Spot Virus in Cultivated Papaya and its Wild Relatives
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Authors
Affiliations
1 ICAR-Indian Institute of Horticultural Research, Bengaluru, IN
2 Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore, IN
1 ICAR-Indian Institute of Horticultural Research, Bengaluru, IN
2 Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore, IN
Source
Journal of Horticultural Sciences, Vol 14, No 2 (2019), Pagination: 130-136Abstract
Papaya ring spot virus (PRSV) disease has been the major impediment in papaya cultivation. The disease is transmitted through three aphid vectors and field tolerance towards this disease varies among Carica papaya cultivars as well as within the Vasconcellea genus. Leaf morphological traits are known to have influence on the probing preferences of aphids. Hence, this study was conducted to know whether the leaf parameters could contribute to the incidence of PRSV possibly by influencing the probing or feeding behaviour of aphid vectors. Leaf parameters viz., leaf thickness, leaf epicuticular wax content, presence and type of trichomes, trichome density were correlated with disease incidence at field conditions. The result revealed that leaf thickness along with epicuticular wax content had significant negative correlation with disease incidence. Similarly, trichome density had negative impact on disease incidence at 99.92% significance level. High epicuticular wax content and high trichome density in V. cauliflora and V. cundinamarcensis were found to be negatively associated with low to very low infection indicating that these parameters may have limited the vector transmission significantly.Keywords
Epicuticular Wax Content, Papaya, Trichome Density and Vasconcellea.References
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- Vegetative Propagation of Papaya (Carica papaya L.) Through Grafting
Abstract Views :97 |
PDF Views:60
Authors
J. Satisha
1,
Linta Vincent
1
Affiliations
1 Division of Fruit Crops, ICAR-Indian Institute of Horticultural Research, Benglauru 560 089, India., IN
1 Division of Fruit Crops, ICAR-Indian Institute of Horticultural Research, Benglauru 560 089, India., IN
Source
Current Science, Vol 124, No 2 (2023), Pagination: 239-244Abstract
In papaya orchards raised through seedlings, large variation in sex forms is a major hindrance to its cultivation on a commercial scale. Similarly, in papaya breeding, if a desirable trait is to be fixed in future generations, it is essential to multiply the plants by asexual means for evaluation on a large scale as sexual propagation has several drawbacks. Limited studies have been conducted on vegetative propagation in papaya under the tropical climate of India. Hence, the present study was initiated to standardize vegetative propagation through grafting under separate experiments. A combination of growth hormones and different aged seedlings was used to induce lateral shoots on the mother plants to utilize them as scions for grafting. Spraying BA @ 100 ppm + GA3 @ 250 ppm on 5–6 month-old mother plants could produce more graftable size shoots. Among different methods, softwood wedge grafting recorded maximum success followed by cleft grafting. Field evaluation of grafted and seedling plants revealed that the former were dwarfs and sturdy, induced early flowering at a lower heights and came to harvest earlier than the seedlings. Though physical fruit parameters showed a significant difference between grafted and seedling plants, no difference was recorded for fruit quality parameters.Keywords
Cytokinins, Grafting, Lateral Shoots, Papaya, Vegetative Propagation.References
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