Reniform Resistance from Texas Day Neutral Lines

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1 Reniform Resistance from Texas Salliana R. Stetina Research Plant Pathologist Crop Genetics and Production Research Unit Stoneville, MS

2 Cultural and Genetic Methods to Manage Reniform Nematode in Cotton Scientists: Lawrence Young (Project Leader) Salliana Stetina Erik Sacks William Meredith, Jr. (collaborator) Postdoctoral Research Associate: Eugenia Winston Technicians: Michael Gafford Kristi Jordan Hans Hinrichsen Scientist: Gabriel Sciumbato Technician: Anna Blessitt

3 Research Objectives Develop management practices to minimize damage by reniform nematode Transfer resistance genes from related species into Upland cotton Effective reniform nematode management Identify plants with resistance or tolerance to reniform nematode Identify plant genes that limit reniform nematode infection

4 Research Objectives Develop management practices to minimize damage by reniform nematode Transfer resistance genes from related species into Upland cotton Effective reniform nematode management Identify plants with resistance or tolerance to reniform nematode Identify plant genes that limit reniform nematode infection

5 Resistance from Related Species and Gene Identification Transfer resistance from Gossypium herbaceum and G. arboreum into G. hirsutum Identify polymorphisms between G. hirsutum and diploid species Determine inheritance of resistance Identify plant genes that have altered regulation in resistant genotypes

6 Research Objectives Develop management practices to minimize damage by reniform nematode Transfer resistance genes from related species into Upland cotton Effective reniform nematode management Identify plants with resistance or tolerance to reniform nematode Identify plant genes that limit reniform nematode infection

7 Identify Resistance or Tolerance Improve or develop screening techniques (greenhouse, lab, field) Evaluate commercial cultivars for tolerance to reniform nematode Assess ability of nematode populations to overcome resistance Resistance from day-neutral Texas race stocks

8 PARENT GENOTYPES PRIMITIVE MATERIALS Gossypium hirsutum T19 T19-12 T19-13 T19-27 T19-3 T T ADAPTED MATERIALS Gossypium hirsutum DES119H DES119B 55-3 T T

9

10

11 T x DES119H #89 min 121 max 36 mean 21 #59 min max 6 mean 3 23

12 23: (field) CROSSES 889 progeny rows (F 2:3 populations) screened 117 selections PARENT LINES 15 rows screened 53 selections 24: (field) 25: (greenhouse) 76 selections 31 selections 31 selections

13 SELECTION CRITERIA 23: (field) 24: (field) 25: (greenhouse) 3 or fewer females/root on each of 5 roots 3 or fewer females/root on at least 4 of 5 roots and 1 or fewer females on all roots AND 151 (6E) or 179 (6W) females/g root on at least 4 of 5 roots examined mean females/g root is 33% or less of susceptible control on 4 roots

14 23: (field) CROSSES 889 progeny rows (F 2:3 populations) screened 117 selections PARENT LINES 15 rows screened 53 selections 24: (field) 25: (greenhouse) 76 selections 31 selections 31 selections

15 23 females/root* number of populations Pedigree 119H 55-3 T19-12 T T19-12/DES119H T1347-2/DES119H T19-12/55-3 T1347-2/55-3 T19-12/T min 1 max mean Statistics for all lines tested within each population The range for all entries evaluated was to 95 females/root. evaluated selected

16 24 females/root* number of populations Pedigree 119H 55-3 T19-12 T T19-12/DES119H T1347-2/DES119H T19-12/55-3 T1347-2/55-3 T19-12/T min max , 3 5 mean Statistics for all lines tested within each population The range for all entries evaluated was to 1, females/root. evaluated selected

17 What s next? Stabilize resistant phenotype Additional crosses Durability of resistance

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