Screening brown spot resistance in rice genotypes at the seedling stage under water stress and irrigated conditions

Dariush, Somayeh; Darvishnia, Mostafa; Ebadi, A.; Padasht-Dehkaei, Fereidoun; Bazgir, Eidi

doi:10.1080/03235408.2020.1741855

Cited by 4 publications

(2 citation statements)

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“…Yield losses due to infection of brown spot on rice leaves in comparison with infection of glumes needed to be investigated. Brown spot is currently regarded as a serious rice disease worldwide [ 13 , 16 ]. To check the resistance of different rice cultivars to brown spot disease, several experiments have been carried out [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Among the top ten fungal diseases, Blast is the leading one causing severe damage in Africa but brown spot is a potent yield reducer amongst the fungal rice diseases in Asia. From the export point of view, this pathogen causes quantity and quality losses that are associated with the disease incidence on the leaves and grain and causes kernel discoloration, which affects the drying, shelling, milling and processing of the rice due to weight loss [11][12][13][14]. It becomes more important not only because of quality deterioration of grains but also due to brown spots on grain which may lead to rejection of consignments at international market.…”

Section: Introductionmentioning

confidence: 99%

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Identification of biochemical indices for brown spot (Bipolaris oryzae) disease resistance in rice mutants and hybrids

Shamshad,

Rashid,

Hameed

et al. 2024

PLoS ONE

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Brown spot caused by Bipolaris oryzae is a major damaging fungal disease of rice which can decrease the yield and value of produce due to grain discoloration. The objectives of the current study were to investigate and understand the biochemical indices of brown spot disease resistance in rice. A total of 108 genotypes (mutant and hybrid) along with Super Basmati and parent RICF-160 were evaluated against brown spot disease. The genotypes exhibiting resistant and susceptible responses to brown spot disease according to the IRRI standard disease rating scale were screened and selected. To study the biochemical response mechanism, forty five selected genotypes along with Super Basmati and RICF-160 were analyzed using the biochemical markers. The physiological and biochemical analysis provided valuable insights and confirmed the resistance of rice hybrids and mutants against brown spot disease. Positive correlations were observed among stress bio-markers and disease response. Rice genotypes i.e. Mu-AS-8, Mu-AS-19, Mu-AS-20 and Mu-AS-35 exhibited moderate resistant response while Hy-AS-92, Hy-AS-98, Hy-AS-99, Hy-AS-101, Hy-AS-102 and Hy-AS-107 showed resistant response to brown spot disease. Brown spot resistant rice genotypes had lesser values of malondialdehyde and total oxidant status and higher antioxidant activities i.e. superoxide dismutase, peroxidase, total phenolic content and lycopene. The selected resistant rice genotypes had resistance capacity against Bipolaris oryzae stress. In conclusion, identified resistant mutants i.e. Mu-AS-8, Mu-AS-19, Mu-AS-20 and Mu-AS-35 and hybrids i.e. Hy-AS-92, Hy-AS-98, Hy-AS-99, Hy-AS-101, Hy-AS-102 and Hy-AS-107 could be used in rice breeding program to achieve sustainable rice production by coping the emerging challenge of brown spot disease under variable climate conditions.

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Section: Introductionmentioning

confidence: 99%