head smut


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head smut

[′hed ‚smət]
(plant pathology)
A fungus disease of corn and sorghum caused by Sphacelotheca reiliana which destroys the head of the plant.
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In this study, we used the technologies of RAPD and SCAR to identify the molecular markers linked to resistant traits of sorghum head smut physiological race 3, and obtained two SCAR markers.
The sorghum seeds of "Tx622B" (susceptible to head smut) and "7050B" (resistant to head smut), as the parents in this study, were obtained from Liaoning Academy of Agricultural Science, and the F2 populations were made by cross between the parents.
Bulked segregant analysis (BSA) was employed for identifying putative markers associated with the head smut resistance.
Linkage analyses of head smut resistance with the two RAPD markers (S18 and S336) were carried out on the F2 populations including 96 resistant individuals and 48 susceptible individuals by PCR.
Two sets of F2 bulks (one for resistance and another for susceptibility to head smut) were amplified using the 10 primers, and polymorphisms were produced with all the primers (data not shown).
Linkage analyses between head smut resistance and the two RAPD markers were performed on 96 F2 resistant individuals and 48 susceptible individuals.
Plant materials and crosses: Parental inbred Ent17 with NLB resistance and parental inbred Ent12 with head smut resistance were provided by International Maize and Wheat Improvement Center (CYMMIT), parental inbred Liao3162 susceptible to both NLB and head smut were provided by Maize institute, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning Province, China.
Primer selection and PCR amplification: According to previously reported linked-markers to resistance genes Ht1, Ht2, Ht3, HtN1 and QTLs to NLB and resistance QTLs to head smut, tightly linked SSR markers falling in or nearby the reported markers were chosen from the public database of maize genome (http://www.maizeGDB.org) and synthesized by Baoshengwu Inc., Dalian, China.
Table I: Sequences of SSR primers used to identify resistance genes Ht1, Ht2, Ht3, HtN1 and head smut resistance QTLs
Note: QTL in the table refers to QTL with resistance to head smut
###Plant height###Ear length###Ear###Kernel number Severity of NLB Severity of head smut
and susceptible to head smut (severity 45%), Ent12 was resistant to head smut (severity 10%) and susceptible to NLB (severity 75%).