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Associations of Environments in South Asia Based on Spot Blotch Disease of Wheat Caused by Cochliobolus sativus

^a Dep. of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu Univ., Varanasi 221005, India
^b CIMMYT South Asia, Regional Office, P.O. Box 5186, Kathmandu, Nepal
^c International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, C.P. 06600, D.F. Mexico
^d Directorate of Wheat Research, Karnal, Haryana, India
^e National Agricultural Research Council, Bhairahawa, Nepal
^f Institute of Agriculture and Animal Science, Rampur, Nepal
^g Wheat Research Centre, BARI, Dinajpur, Bangladesh
^h Regional Agricultural Research Station, Jessore, Bangladesh
ⁱ Assam Agriculture Univ., Shillongani, Assam, India
^j Bihar Agriculture College, Sabour, Bihar, India
^k Dep. of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu Univ., Varanasi 221005, India

View larger version (12K): [in this window] [in a new window]   Figure 1a. Dendrogram from the classification of eight locations in EGPSN over five years (2000–2001 to 2004–2005) of testing in South Asia for AUDPC of spot blotch disease of wheat using weighted environment standardized squared Euclidean distance as the dissimilarity measure. A hierarchical agglomerative classification procedure using squared Euclidean distance as the dissimilarity measure and incremental sum of squares as the clustering strategy was used.

View larger version (10K): [in this window] [in a new window]   Figure 1b. Dendrogram from the classification of five locations in Eastern Gangetic Plains Yield Trial (EGPYT), respectively over five years of testing (2000–2001 to 2004–2005) in South Asia for AUDPC of spot blotch disease of wheat using weighted environment standardized squared Euclidean distance as the dissimilarity measure. A hierarchical agglomerative classification procedure using squared Euclidean distance as the dissimilarity measure and incremental sum of squares as the clustering strategy was used.

View larger version (31K): [in this window] [in a new window]   Figure 2. Eight locations of three countries in South Asia Region used in the pattern analysis for AUDPC of spot blotch of wheat.

View larger version (19K): [in this window] [in a new window]   Figure 3a. Proximity plot of the first and second principal coordinate axes of eight locations used in Eastern Gangetic Plains Nursery (EGPSN) over five years of testing using weighted environment standardized squared Euclidean distance as the dissimilarity measure. The four group level obtained from the location classification is superimposed on the ordination.

View larger version (19K): [in this window] [in a new window]   Figure 3b. Proximity plot of the first and second principal coordinate axes of five locations used in Eastern Gangetic Plains Yield Trial (EGPYT) nursery over five years of testing using weighted environment standardized squared Euclidean distance as the dissimilarity measure. The three group level obtained from the location classification is superimposed on the ordination.

View larger version (19K): [in this window] [in a new window]   Figure 4a. Site regression model (SREG) biplot of number of locations and years on the performance of six common check lines in 40 environments (eight locations and five years) of Eastern Gangetic Plains Nursery (EGPSN) of South Asia. Bh4, Bhairahawa EGPSN4; Bh5, Bhairahawa EGPSN5; Bh6, Bhairahawa EGPSN6; Bh7, Bhairahawa EGPSN7; Bh8, Bhairahawa EGPSN8; Di4, Dinjapur EGPSN4; Di5, Dinjapur EGPSN5; Di6, Dinjapur EGPSN6; Di7, Dinjapur EGPSN7; Di8, Dinjapur EGPSN8; Je4, Jessore EGPSN4; Je5, Jessore EGPSN5; Je6, Jessore EGPSN6; Je7, Jessore EGPSN7; Je8, Jessore EGPSN8; Ka4, Karnal EGPSN4; Ka5, Karnal EGPSN5; Ka6, Karnal EGPSN6; Ka7, Karnal EGPSN7; Ka8, Karnal EGPSN8; Ra4, Rampur EGPSN4; Ra5, Rampur EGPSN5; Ra6, Rampur EGPSN6; Ra7, Rampur EGPSN7; Ra8, Rampur EGPSN8; Sa4, Sabour EGPSN4; Sa5, Sabour EGPSN5; Sa6, Sabour EGPSN6; Sa7, Sabour EGPSN7; Sa8, Sabour EGPSN8; Sh4, Shillongani EGPSN4; Sh5, Shillongani EGPSN5; Sh6, Shillongani EGPSN6; Sh7, Shillongani EGPSN7; Sh8, Shillongani EGPSN8; Va4, Varanasi EGPSN4; Va5, Varanasi EGPSN5; Va6, Varanasi EGPSN6; Va7, Varanasi EGPSN7; Va8, Varanasi EGPSN8.

View larger version (15K): [in this window] [in a new window]   Figure 4b. Site regression model (SREG) biplot of number of locations and years on the performance of four common check lines in 25 environments (five locations and five years) of Eastern Gangetic Plains Yield Trial (EGPYT) nursery of South Asia. Bh2, Bhairahawa EGPYT2; Bh3, Bhairahawa EGPYT3; Bh4, Bhairahawa EGPYT4; Bh5, Bhairahawa EGPYT5; Bh6, Bhairahawa EGPYT6; Di2, Dinjapur EGPYT2; Di3, Dinjapur EGPYT3; Di4, Dinjapur EGPYT4; Di5, Dinjapur EGPYT5; Di6, Dinjapur EGPYT6; Je2, Jessore EGPYT2; Je3, Jessore EGPYT3; Je4, Jessore EGPYT4; Je5, Jessore EGPYT5; Je6, Jessore EGPYT6; Ra2, Rampur EGPYT2; Ra3, Rampur EGPYT3; Ra4, Rampur EGPYT4; Ra5, Rampur EGPYT5; Ra6, Rampur EGPYT6; Va2, Varanasi EGPYT2; Va3, Varanasi EGPYT3; Va4, Varanasi EGPYT4; Va5, Varanasi EGPYT5; Va6, Varanasi EGPYT6.