Luis Inostroza1, Soledad Espinoza2, Viviana Barahona2, Macarena Gerding3, Alan Humphries4, Alejandro Del Pozo5, Carlos Ovalle6. 1. CRI-Quilamapu, Instituto de Investigaciones Agropecuaria, Chillán 3780000, Chile. 2. CRI-Raihuen Instituto de Investigaciones Agropecuaria, Cauquenes 3690000, Chile. 3. Facultad de Agronomía, Universidad de Concepción, Chillán 3780000, Chile. 4. South Australian Research and Development Institute (SARDI), Adelaide, SA 5000, Australia. 5. Centro de Mejoramiento Genético y Fenómica Vegetal, Facultad de Ciencias Agrarias, Universidad de Talca, Talca 3460000, Chile. 6. CRI-La Cruz, Instituto de Investigaciones Agropecuaria, La Cruz 228000, Chile.
Abstract
The phenotypic diversity and productivity of a diverse alfalfa (M. sativa subspp.) panel of cultivars, landraces and wild relatives with putative drought tolerance were evaluated in two Mediterranean environments (central Chile and Southern Australia). In Chile, 70 accessions were evaluated in rainfed conditions and in Australia 30 accessions under rainfed and irrigated conditions, during three growing seasons. Large phenotypic variation was observed among and within subspecies for NDVI, stem length, intercepted PAR and forage yield. Principal component analysis indicated that the first two principal components (PC) accounted for 84.2% of total variance; fall dormancy, taxa, and breeding status were closely related to the agronomical performance of alfalfa accessions. Forage yield varied largely among accessions across years and locations. A linear relationship was found between annual forage yield and annual water added to the experiments (R2 = 0.60, p < 0.001). The GxE analysis for forage yield allowed the detection of the highest yielding accessions for each of the two mega-environments identified. The accessions CTA002 and CTA003 showed greater forage yield in both Chile and Australia environments. It is concluded that new breeding lines derived from crosses between cultivated alfalfa (M. sativa subsp. sativa) and wild relatives belonging to the primary (M. sativa subsp. falcata) and tertiary (M. arborea) gene pool, achieve outstanding agronomical performance in drought-prone environments.
The phenotypic diversity and productivity of a diverse n class="Species">alfalfa (n class="Species">M. sativa subspp.) panel of cultivars, landraces and wild relatives with putative drought tolerance were evaluated in two Mediterranean environments (central Chile and Southern Australia). In Chile, 70 accessions were evaluated in rainfed conditions and in Australia 30 accessions under rainfed and irrigated conditions, during three growing seasons. Large phenotypic variation was observed among and within subspecies for NDVI, stem length, intercepted PAR and forage yield. Principal component analysis indicated that the first two principal components (PC) accounted for 84.2% of total variance; fall dormancy, taxa, and breeding status were closely related to the agronomical performance of alfalfa accessions. Forage yield varied largely among accessions across years and locations. A linear relationship was found between annual forage yield and annual water added to the experiments (R2 = 0.60, p < 0.001). The GxE analysis for forage yield allowed the detection of the highest yielding accessions for each of the two mega-environments identified. The accessions CTA002 and CTA003 showed greater forage yield in both Chile and Australia environments. It is concluded that new breeding lines derived from crosses between cultivated alfalfa (M. sativa subsp. sativa) and wild relatives belonging to the primary (M. sativa subsp. falcata) and tertiary (M. arborea) gene pool, achieve outstanding agronomical performance in drought-prone environments.
Authors: Elisa Biazzi; Nelson Nazzicari; Luciano Pecetti; E Charles Brummer; Alberto Palmonari; Aldo Tava; Paolo Annicchiarico Journal: PLoS One Date: 2017-01-09 Impact factor: 3.240
Authors: Mervat R I Sayed; Khalid S Alshallash; Fatmah Ahmed Safhi; Aishah Alatawi; Salha Mesfer ALshamrani; Eldessoky S Dessoky; Ashwaq T Althobaiti; Mohammed M Althaqafi; Hany S Gharib; Wafaa W M Shafie; Mamdouh M A Awad-Allah; Fadia M Sultan Journal: Genes (Basel) Date: 2022-08-24 Impact factor: 4.141