Publication Date
1993
Description
Sixty plants each of 2 lines of perennial ryegrass (lolium perenne L.) selected for low (LS) or high (HS) leaf shear breaking load were grown in a controlled environment. Transverse sections of 22 plants were taken to measure cross-sectional area (CSA) and proportions of sclerenchyma. LS leaves had significantly (P<0.001) lower lengths (258 v. 316 mm), widths (3.4 v. 4.0 mm), dry weights (32 v, 48 mg) and shear breaking loads (338 v. 574 g/leaO. CSA, estimated from the relationship CSA (mm2) = 0.265 width (mm) -0.239 (r2=0.86), was also significantly (P<0,001) lower for LS (0.68 v. 0.85 mm1), Leaf shear strengths per unit CSA were calculated as 501 (LS) and 690 (HS) g/mm1 (P<0.001). Sclerenchyma formed a significantly (P<0.01) lower proportion of LS than HS leaves (2,9 v. 6.1% of CSA). The cumulative force required to reduce particle sizes to 1 mm can be expressed as an Inde11 of Masticatory Load (IML) IML values were 2.84(LS) and 3.9l(HS) kg/mg DM (P<0,001), suggesting rates of passage from the rumen might be greater for LS leaves.
Citation
Inoue, T; Brookes, I M.; Barry, A. John T.N; and Hunt, W F., "Physical Resistance, Structure and Morphology of Perennial Ryegrass Leaves" (2024). IGC Proceedings (1993-2023). 18.
https://uknowledge.uky.edu/igc/1993/session14/18
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Physical Resistance, Structure and Morphology of Perennial Ryegrass Leaves
Sixty plants each of 2 lines of perennial ryegrass (lolium perenne L.) selected for low (LS) or high (HS) leaf shear breaking load were grown in a controlled environment. Transverse sections of 22 plants were taken to measure cross-sectional area (CSA) and proportions of sclerenchyma. LS leaves had significantly (P<0.001) lower lengths (258 v. 316 mm), widths (3.4 v. 4.0 mm), dry weights (32 v, 48 mg) and shear breaking loads (338 v. 574 g/leaO. CSA, estimated from the relationship CSA (mm2) = 0.265 width (mm) -0.239 (r2=0.86), was also significantly (P<0,001) lower for LS (0.68 v. 0.85 mm1), Leaf shear strengths per unit CSA were calculated as 501 (LS) and 690 (HS) g/mm1 (P<0.001). Sclerenchyma formed a significantly (P<0.01) lower proportion of LS than HS leaves (2,9 v. 6.1% of CSA). The cumulative force required to reduce particle sizes to 1 mm can be expressed as an Inde11 of Masticatory Load (IML) IML values were 2.84(LS) and 3.9l(HS) kg/mg DM (P<0,001), suggesting rates of passage from the rumen might be greater for LS leaves.
