TY  - JOUR
AV  - public
UR  - http://dx.doi.org/10.1094/PDIS-10-14-1089-RE
IS  - 12
PB  - American Phytopathological Society (APS)
TI  - Selection of Host Differentials for Elucidating Pathogenic Variation in Magnaporthe grisea Populations Adapted to Finger Millet (Eleusine coracana)
A1  - Babu, T K
A1  - Sharma, R
A1  - Thakur, R P
A1  - Upadhyaya, H D
A1  - Reddy, P N
A1  - Girish, A G
N1  - Blast, caused by Pyricularia grisea (teleomorph: Magnaporthe grisea), is the most devastating disease of finger millet affecting production, utilization, and trade in Africa and Southeast Asia. An attempt was made to select a set of putative host differentials that can be used to determine virulence diversity in finger-millet-infecting populations of M. grisea. Thus, a differential set comprising eight germplasm accessions selected from finger millet core collection (IE 2911, IE 2957, IE 3392, IE 4497, IE 5091, IE 6240, IE 6337, and IE 7079) and a resistant (?GPU 28?) and a susceptible (?VR 708?) variety was developed. This differential set was used to study pathogenic variation in 25 isolates of M. grisea collected from Karnataka, Telangana, and Andhra Pradesh states in India. Based on the reaction (virulent = score ?4 and avirulent = score ?3 on a 1-to-9 scale) on host differentials, nine pathotypes were identified among 25 M. grisea isolates. Pathotype 9, represented by isolate Pg23 from Vizianagaram, was the most virulent because it could infect all of the host differentials except GPU 28. This study will be helpful in devising strategies for monitoring virulence change in M. grisea populations, and for identification of blast resistance in finger millet for use in disease resistance breeding programs.
SN  - 0191-2917
VL  - 99
N2  - Blast, caused by Pyricularia grisea (teleomorph: Magnaporthe grisea), is the most devastating disease of finger millet affecting production, utilization, and trade in Africa and Southeast Asia. An attempt was made to select a set of putative host differentials that can be used to determine virulence diversity in finger-millet-infecting populations of M. grisea. Thus, a differential set comprising eight germplasm accessions selected from finger millet core collection (IE 2911, IE 2957, IE 3392, IE 4497, IE 5091, IE 6240, IE 6337, and IE 7079) and a resistant (?GPU 28?) and a susceptible (?VR 708?) variety was developed. This differential set was used to study pathogenic variation in 25 isolates of M. grisea collected from Karnataka, Telangana, and Andhra Pradesh states in India. Based on the reaction (virulent = score ?4 and avirulent = score ?3 on a 1-to-9 scale) on host differentials, nine pathotypes were identified among 25 M. grisea isolates. Pathotype 9, represented by isolate Pg23 from Vizianagaram, was the most virulent because it could infect all of the host differentials except GPU 28. This study will be helpful in devising strategies for monitoring virulence change in M. grisea populations, and for identification of blast resistance in finger millet for use in disease resistance breeding programs.
SP  - 1784
Y1  - 2015///
EP  - 1789
ID  - icrisat10561
KW  - Finger Millet
KW  -  Pathogenic Variation
KW  -  Finger millet blast
KW  -  Plant breeding
KW  -  Pathogenic variability
KW  -  Plant cultivars
JF  - Plant Disease
ER  -