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Sci Rep. 2017 Aug 11;7(1):7968. doi: 10.1038/s41598-017-08532-7.

Identification of mega-environments and rice genotypes for general and specific adaptation to saline and alkaline stresses in India.

Author information

1
Central Soil Salinity Research Institute, Karnal, India. krishnagene@gmail.com.
2
Central Soil Salinity Research Institute, Karnal, India.
3
Central Soil Salinity Research Institute, Regional Research Station, Lucknow, India.
4
Central Soil Salinity Research Institute, Regional Research Station, Canning Town, India.
5
Central Island Agricultural Research Institute, Port Blair, A & N Islands, India.
6
Central Coastal Agricultural Research Institute (CCARI), Ela, Goa, India.
7
National Rice Research Institute (NRRI), Cuttack, Odisha, India.
8
Indian Institute of Rice Research, Telengana, India.
9
Dr. Balasaheb Sawant Konkan KrishiVidyapeeth, Khar Land, Panvel, India.
10
Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal, India.
11
Narendra Deva University of Agriculture & Technology, Faizabad, Uttar Pradesh, India.
12
Rajendra Agricultural University, Samastipur, India.
13
Anbil Dharmalingam Agricultural College and Research Institute, Trichy, India.
14
Punjab Agricultural University, Ludhiana, India.
15
Chandra Shekhar Azad University of Agriculture & Technology, Kanpur, Uttar Pradesh, India.
16
Centre for Strategic Studies, Salt Lake City, India.
17
Annamalai University, Chidambaram, Tamil Nadu, India.
18
Division of Plant Breeding, IRRI, Philippines.
19
Crop and Environmental Sciences Division, IRRI, Philippines.
20
Division of Plant Breeding, IRRI, Philippines. r.k.singh@irri.org.

Abstract

In the present study, a total of 53 promising salt-tolerant genotypes were tested across 18 salt-affected diverse locations for three years. An attempt was made to identify ideal test locations and mega-environments using GGE biplot analysis. The CSSRI sodic environment was the most discriminating location in individual years as well as over the years and could be used to screen out unstable and salt-sensitive genotypes. Genotypes CSR36, CSR-2K-219, and CSR-2K-262 were found ideal across years. Overall, Genotypes CSR-2K-219, CSR-2K-262, and CSR-2K-242 were found superior and stable among all genotypes with higher mean yields. Different sets of genotypes emerged as winners in saline soils but not in sodic soils; however, Genotype CSR-2K-262 was the only genotype that was best under both saline and alkaline environments over the years. The lack of repeatable associations among locations and repeatable mega-environment groupings indicated the complexity of soil salinity. Hence, a multi-location and multi-year evaluation is indispensable for evaluating the test sites as well as identifying genotypes with consistently specific and wider adaptation to particular agro-climatic zones. The genotypes identified in the present study could be used for commercial cultivation across edaphically challenged areas for sustainable production.

PMID:
28801586
PMCID:
PMC5554213
DOI:
10.1038/s41598-017-08532-7
[Indexed for MEDLINE]
Free PMC Article

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