Heat tolerance in rice mutants is associated with reduced accumulation of reactive oxygen species

Panigrahy, Madhusmita; Neelamraju, Sarla; Rao, D. N.; Ramanan, Rajeshwari

doi:10.1007/s10535-011-0175-7

Cited by 19 publications

(14 citation statements)

References 26 publications

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“…However, the actual step of CK involvement in the Chl metabolic pathway and the mechanisms by which it could retard senescence are not known. An ethylmethane sulfonate (EMS)-induced, stay-green mutant ( N22-H-dgl162 ) of the Nagina22 (N22) rice cultivar showing delayed senescence was earlier identified in a field screen under prolonged drought and heat conditions ( Panigrahy et al , 2011 ). The aim of this study was to investigate the mechanism of CK-mediated delay of dark-induced senescence (DIS) in rice, taking cues from the stay-green mutant.…”

Section: Introductionmentioning

confidence: 99%

Cytokinin delays dark-induced senescence in rice by maintaining the chlorophyll cycle and photosynthetic complexes

Talla

Panigrahy

Kappara

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Cytokinin delays dark-induced senescence in rice by maintaining the chlorophyll cycle and photosynthetic complexes

Talla

Panigrahy

Kappara

et al. 2016

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“…Nagina 22 is a well-known aus variety used routinely as a check for heat tolerance in rice (Jagadish et al, 2010). In a network project, EMS-induced stabilized N22 mutants were evaluated for different traits, such as tolerance to herbicide, heat, low P, water deficiency, and salinity and resistance to bacterial leaf blight and blast (Kulkarni et al, 2013(Kulkarni et al, , 2014Lima et al, 2015;Mithra et al, 2016;Mohapatra et al, 2014;Panigrahy et al, 2009Panigrahy et al, , 2011Panigrahy et al, , 2014Poli et al, 2013;Talla et al, 2016). As a part of the network project on functional genomics, a total of 2500 N22 mutants were screened at the Indian Institute of Rice Research (IIRR) under field conditions maintained with low P (Olsen P, <1.8) to identify low-P-tolerant and susceptible mutants.…”

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confidence: 99%

Comparing Hydroponics, Sand, and Soil Medium To Evaluate Contrasting Rice Nagina 22 Mutants for Tolerance to Phosphorus Deficiency

et al. 2017

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Soils deficient in P are widespread in major rice (Oryza sativa L.) ecosystems. In view of declining reserves of rock phosphate and the rising costs of P fertilizers, breeding rice varieties tolerant to low P has become important for future food security. Four different methods (hydroponics without sand [H], hydroponics with sand [HS], large pots with soil [PS], and glasses with soil [GS]) were evaluated using rice aus variety Nagina 22 (N22) and its known gain‐of‐function (gof) and loss‐of‐function (lof) mutants to screen for low P tolerance in the field. In −P (no addition of NaH2PO4) shoots, dry weight was significantly higher in gof mutant NH787 than in N22 in HS, PS, and GS but not in H, with fold increases of 1.8 in HS, 5.2 in GS, and 9.4 in PS. In HS, in −P, out of six traits only shoot dry weight was significantly higher in gof and lower in lof mutants. However, in GS both root and shoot dry weight could confirm gof and lof mutants. It took 40 d in GS and 70 d in PS to differentiate between growth in –P/low P and +P (0.32 mM NaH2PO4) and between gof and lof mutants. Thus, shoot dry weight at 30 d in HS and root and shoot dry weight at 40 d in GS are best to differentiate between genotypes grown in –P/low P and +P soil and also between gof and lof mutants for low P tolerance. The HS method can be performed in ambient conditions and needs 70% less medium compared with H. If germplasm is to be screened for low P tolerance on a large scale and if there is no access to low‐P soil, then screening using HS is the best approach.

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“…Marri et al 2005 also reported that RM250 was a marker interval of QTL for panicle length (pl2.1) in addition to spikelet number and grain weight in BC 2 testcross progeny of KMR3 introgression lines. Allele at locus RM274, associated with HSI of yield per plant was contributed by N22 and NH219, which were reported earlier as heat tolerant (Jagadish et al 2010b;Panigrahy et al 2011;Poli et al 2013). This marker was also linked to spikelet fertility in both control and heat stress conditions in RIL population of Zhongyouzao8 x Toyonishiki and the allele for heat tolerance was from the heat tolerant parent, Zhongyouzao8 (Zhang et al 2008).…”

Section: Discussionmentioning

confidence: 73%

Field level evaluation of rice introgression lines for heat tolerance and validation of markers linked to spikelet fertility

Prasanth

Basava

Babu

et al. 2016

Physiol Mol Biol Plants

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Rice lines derived from wild species and mutants can serve as a good resource for favorable alleles for heat tolerance. In all, 48 stable lines including 17 KMR3/O. rufipogon introgression lines (KMR3 ILs), 15 Swarna/O. nivara ILs (Swarna ILs) along with their parents, Nagina 22 (N22) and its 4 EMS induced mutants and 7 varieties were evaluated for heat tolerance under irrigated conditions under field in two seasons, wet season 2012 using poly cover house method and dry season 2013 using late sown method. Spikelet fertility (SF), yield per plant (YP) and heat susceptibility index (HSI) for these two traits were considered as criteria to assess heat tolerance compared to control. Four KMR3 ILs and eight Swarna ILs were identified as heat tolerant based on SF and YP and their HSIs in both wet and dry seasons. S-65 and S-70 showed low SF and high YP consistently in response to heat in both seasons. We provide evidence that SF alone may not be the best criterion to assess heat tolerance and including YP is important as lines with low SF but high YP and vice versa were identified under heat stress. Out of 49 SSR markers linked to spikelet fertility, 18 were validated for five traits. RM229 in wet season and RM430 and RM210 in dry season were significantly associated with both SF and its HSI under heat stress. RM430 was also significantly associated with both YP and its HSI in dry season. Thirty two candidate genes were identified close to nine markers associated with traits under heat stress.

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Heat tolerance in rice mutants is associated with reduced accumulation of reactive oxygen species

Cited by 19 publications

References 26 publications

Cytokinin delays dark-induced senescence in rice by maintaining the chlorophyll cycle and photosynthetic complexes

Cytokinin delays dark-induced senescence in rice by maintaining the chlorophyll cycle and photosynthetic complexes

Comparing Hydroponics, Sand, and Soil Medium To Evaluate Contrasting Rice Nagina 22 Mutants for Tolerance to Phosphorus Deficiency

Field level evaluation of rice introgression lines for heat tolerance and validation of markers linked to spikelet fertility

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