Molecular characterization of disease resistance in Brassica juncea – The current status and the way forward

Abstract

Indian mustard (Brassica juncea) is an allotetraploid (AABB, 2n = 18), formed by hybridization between the A and B genome diploid Brassica species B. rapa and B. nigra, respectively. Yang et al. (2016) recently sequenced the B. juncea genome and reported a genome size of 954.90 Mb, providing the first Brassica B genome assembly. B. juncea is an important winter season oilseed crop (Kumar, 2012) that is also grown as a condiment crop and as a green vegetable (Rakow, 2004). It is cultivated worldwide, with

Genome-Wide Identification and Evolution of Receptor-Like Kinases (RLKs) and Receptor like Proteins (RLPs) in Brassica juncea

“…Brassica juncea , commonly known as Indian mustard, is an allotetraploid plant species with AABB genome produced by natural interspecific hybridisation between the diploid species B. nigra (BB) and B. rapa (AA) [ 32 , 33 ]. It is widely planted, as it is known to contain many beneficial agronomic traits compared to B. napus , such as increased heat and drought tolerance, high blackleg and shatter resistance and early vigour [ 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. The B. juncea reference genome, 922 Mb in length, is currently available [ 33 ].…”

Virus Diseases of Cereal and Oilseed Crops in Australia: Current Position and Future Challenges

“…In Australia, the most serious virus disease of oilseed brassicas is caused by TuYV. However, due to the appearance of a resistance breaking strain that overcomes the turnip mosaic virus (TuMV; genus Potyvirus, family Potyviridae) resistances present in Australian canola cultivars, the second most serious is caused by TuMV [26,77,[198][199][200][201][202][203][204][205][206][207][208][209][210][211][212][213][214][215]. Both are important in the continent's Mediterranean, temperate and subtropical climatic regions (Figure 1; Table 2).…”

“…Furthermore, TuYV not only infects crops and weeds in the Brassicaceae, but also a wide range of other species belonging to different plant families. These natural hosts include crop volunteer, pasture and weed species in the Amaranthaceae, Apiaceae, Asteraceae, Boraginaceae, Cucurbitacae, Euphorbiaceae, Fabaceae, Geraniaceae, Malvaceae, Oxalidaceae, Portulacaceae, Rhizophoraceae, Solanaceae and Tropaeolaceae [13,[25][26][27][28][29][30]77,199,201,203,206,207,[211][212][213][214][230][231][232][233][234][235][236][237][238][239][240].…”

“…TuYV is not known to be seed-borne or transmitted by contact [13]. In addition to infecting canola and Indian mustard, other cultivated plant species it infects in Australia include diverse vegetable and forage brassicas, crop and pasture legumes, and sugar beet (Beta vulgaris), lettuce (Lactuca sativa), spinach (Spinacia oleracea), potato (Solanum tuberosum), melon (Cucumis melo), coriander (Coriandrum sativum) and parsley (Petroselinum crispum) [13,[25][26][27][28][29][30]200,201,203,206,214,230,232,233,236,237,239]. Amongst the many wild Australian hosts within different plant families found infected with TuYV mentioned above (see first paragraph in this Section), the most common infection reservoirs for its spread to oilseed crops include: Raphanus raphanistrum (wild radish), Rapistrum rugosum (turnip weed), Myagrum perfoliatum (muskweed), Malva parviflora (marshmallow) and Sonchus oleraceous (common sowthistle) [199,201,206,230,231,236].…”

“…Each of these included a summary of the virus disease situation in these species up to the time they were published [20][21][22][23][24]. Two other past general plant disease reviews did this with cool season grain legume and mustard (B. juncea and B. carinata) crops [25,26]. However, very few past reviews focused solely upon virus diseases in Australia.…”