Variability in <i>Phytophthora nicotianae</i> var. <i>parasitica</i> causing buckeye rot on tomato in north-western Himalayas

Kaur, Gurpreet; Malannavar, Anudeep B; Banyal, D. K.

doi:10.5958/2249-8788.2019.00003.9

Cited by 2 publications

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“…Although root volume following Phytophthora inoculation reduced in respect to their non-inoculated seedlings, however, the reduction was rather higher in RLC-7 and rough lemon (18.18-18.42%) and the lower in Troyer citrange and sour orange (5.76-9.76%) that the rest of the rootstock genotypes evaluated. Kaur et al (2013) also recorded the high reduction in the leaf number (-32.72%), seedling height (-21.82%), feeder root length (-23.32%) and feeder root volume (-63.45%) in Phytophthora inoculated rough lemon seedlings than Carrizo citrange. Dhakad et al (2014) found rough lemon to be the highly susceptible rootstock as it showed the maximum reduction in leaves, seedling height, feeder root volume, feeder root length, tap root length and root weight, while lowest reductions in these attributes was observed in Citrumelo rootstock.…”

Section: Resultsmentioning

confidence: 84%

Response of the citrus rootstock genotypes against artificial inoculation of Phytophthora nicotianae

Singh¹,

Sharma²,

Dubey³

et al. 2018

Indian J Agri Sci

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Effect of Phytophthora nicotianae Breda de Haan pathogen on different rootstock genotypes including sour orange, Troyer citrange and six variants of C. jambhiri Lush, viz. RLC-5, RLC-6, RLC-7, Grambhiri, rough lemon and Italian rough lemon were studied. Of the various rootstocks, Phytophthora inoculation tended to show significantly maximum plant height in Grambhiri (30.45cm). Significantly highest leaf numbers/plant (30.45), fresh root mass (4.13g) and dry root mass (2.47g) were recorded in the infected plants of RLC-5, however, it was statistically similar with sour orange, Italian rough lemon and Troyer citrange for leaf numbers, RLC-6 and Grambhiri for fresh root mass and RLC-6 and Italian rough lemon for stem diameter. RLC-6 had the highest stem diameter (3.62 cm) without having significant difference with RLC-5, RLC-7 and Italian rough lemon. After fungal inoculation, Troyer citrange showed the highest feeder root volume (2.45 cm3) followed by sour orange. These two rootstocks also prove superiority to have the highest photosynthetic rate (A) and transpiration rate (E) over other infected genotypes of citrus rootstocks tested. Except Italian rough lemon and rough lemon, all the rootstocks were found similar statistically in respect of stomatal conductance (gs). Overall,Troyer citrange proved best, and showed the lowest reduction in growth and physiological attributes after fungal inoculation. Being a Phytophthora tolerant rootstock, Troyer citrange was considered the standard rootstock to study the per cent change in disease incidence and feeder root infection in other genotypes, which indicated sour orange to be the next best rootstock. Of the six variants of Italian rough lemon, RLC-5 and RLC-6 tended to show the lower root infection than rest of the variants studied.

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Section: Resultsmentioning

confidence: 84%

Response of the citrus rootstock genotypes against artificial inoculation of Phytophthora nicotianae

Singh¹,

Sharma²,

Dubey³

et al. 2018

Indian J Agri Sci

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Buckeye Rot of Tomato in India: Present Status, Challenges, and Future Research Perspectives

2022

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Tomato in India is commonly exposed to various diseases of fungal, bacterial, and viral origin, resulting in substantial yield losses (≥50%). Buckeye rot (caused by Phytophthora nicotianae var. parasitica) is among the major constraints in the successful cultivation of tomato crops in various parts of the world including the Solan district of Himachal Pradesh state, India. The fruit rot becomes more devastating under high humidity and wet soils. Symptoms generally appear on green fruit as alternate dark and light brown concentric rings. The genome size of P. nicotianae var. parasitica is 82 Mb with >23,000 predicted genes. High humidity (> 60%) and optimal temperatures (20-25 ºC), along with rainfall (≥ 10 mm), help to disperse the pathogen as the inoculum reaches the fruit through splashing rains. Sporangia germinate indirectly by producing zoospores at 20-25o C, or directly via germ tubes at >25ºC. In the absence of suitable resistant varieties, no single management practice is sufficient to keep the disease below the economic threshold level; therefore, integration of cultural and chemical methods is preferable. This paper aims to focus on the etiology, and management challenges of buckeye rot. We recommend innovative disease management strategies like identification and deployment of resistant cultivars as well as spraying of synthetic chemical fungicides, biocontrol agents, and use of abiotic chemicals that induce resistance, for developing sustainable crop production practices.

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Variability in Phytophthora nicotianae var. parasitica causing buckeye rot on tomato in north-western Himalayas

Cited by 2 publications

References 0 publications

Response of the citrus rootstock genotypes against artificial inoculation of Phytophthora nicotianae

Response of the citrus rootstock genotypes against artificial inoculation of Phytophthora nicotianae

Buckeye Rot of Tomato in India: Present Status, Challenges, and Future Research Perspectives

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