TY - JOUR
T1 - Does the “high sugar” trait of perennial ryegrass cultivars express under temperate climate conditions?
AU - Rivero, M. Jordana
AU - Balocchi, Oscar A.
AU - Moscoso, Cristian J.
AU - Siebald, Juan Agustín
AU - Neumann, Fabián Lukas
AU - Meyer, Don
AU - Lee, Michael R.F.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - The objective was to evaluate water-soluble carbohydrate (WSC) and crude protein (CP) concentration of perennial ryegrass (PRG) cultivars with different genetic potential for producing WSC under two contrasting agronomic managements in temperate climate (southern Chile). A 4 × 2 factorial design was randomly allocated to 24 plots (31 m2 each, three blocks): four PRG cultivars (diploid standard cultivar, “2nSt”; tetraploid standard cultivar, “4nSt”; diploid high sugar cultivar developed in New Zealand, “2nHSNZ”; and tetraploid high sugar cultivar developed in Europe, “4nHSEU”) and two agronomic managements (“favourable,” defoliations at three leaves per tiller and nitrogen (N) fertilization rate of 83.3 kg N ha−1year−1; “unfavourable,” defoliations at two leaves per tiller and N fertilization rate of 250 kg N ha−1year−1). Herbage samples were collected in early spring, spring, summer and autumn. Concentration of WSC did not differ among cultivars in spring and summer, averaging 194 and 251 g/kg DM, respectively. The cultivar 4nHSEU had the greatest WSC concentration in early spring and autumn (187 and 266 g/kg DM, respectively) and the greatest CP concentration across samplings (average 230 g/kg DM). Favourable management improved WSC concentrations in early spring and summer and decreased CP in spring, summer and autumn. Annual DM yield did not vary with cultivar or management, averaging 8.43 t/ha. Within a 12-month study at one site in a temperate environment in southern Chile, PRG cultivars have not shown a consistent expression of the “high sugar” trait, where a genetic × environment interaction might be operating.
AB - The objective was to evaluate water-soluble carbohydrate (WSC) and crude protein (CP) concentration of perennial ryegrass (PRG) cultivars with different genetic potential for producing WSC under two contrasting agronomic managements in temperate climate (southern Chile). A 4 × 2 factorial design was randomly allocated to 24 plots (31 m2 each, three blocks): four PRG cultivars (diploid standard cultivar, “2nSt”; tetraploid standard cultivar, “4nSt”; diploid high sugar cultivar developed in New Zealand, “2nHSNZ”; and tetraploid high sugar cultivar developed in Europe, “4nHSEU”) and two agronomic managements (“favourable,” defoliations at three leaves per tiller and nitrogen (N) fertilization rate of 83.3 kg N ha−1year−1; “unfavourable,” defoliations at two leaves per tiller and N fertilization rate of 250 kg N ha−1year−1). Herbage samples were collected in early spring, spring, summer and autumn. Concentration of WSC did not differ among cultivars in spring and summer, averaging 194 and 251 g/kg DM, respectively. The cultivar 4nHSEU had the greatest WSC concentration in early spring and autumn (187 and 266 g/kg DM, respectively) and the greatest CP concentration across samplings (average 230 g/kg DM). Favourable management improved WSC concentrations in early spring and summer and decreased CP in spring, summer and autumn. Annual DM yield did not vary with cultivar or management, averaging 8.43 t/ha. Within a 12-month study at one site in a temperate environment in southern Chile, PRG cultivars have not shown a consistent expression of the “high sugar” trait, where a genetic × environment interaction might be operating.
KW - defoliation frequency
KW - G × E interaction
KW - high sugar grass
KW - temperate climate
KW - water-soluble carbohydrates
UR - http://www.scopus.com/inward/record.url?scp=85060823111&partnerID=8YFLogxK
U2 - 10.1111/gfs.12406
DO - 10.1111/gfs.12406
M3 - Article (Academic Journal)
C2 - 31598023
AN - SCOPUS:85060823111
SN - 0142-5242
VL - 74
SP - 1
EP - 13
JO - Grass and Forage Science
JF - Grass and Forage Science
IS - 3
ER -