Temperature effects on lignin, hemicellulose and cellulose in tropical and temperate grasses

Abstract

Thirteen tropical and 11 temperate grasses were grown in controlled environment under daylnight temperatures of 21/13, 27/19 and 32124°C. Neutral detergent fibre (NDF) was prepared from the fifth leaf on the main stem of each plant, 2 days after it had reached maximum length. Panicum maximum var. trichoglume (tropical) and Loliumperenne cv. S24 (temperate) were also harvested at 4,8, and 12 days after this stage of development. For the tropical grasses NDF values, corrected for starch and protein, decreased with increasing growth temperature, whereas in the temperate species they increased. In the tropical group the decrease in NDF was due to a lower cellulose content, whereas hemicellulose and lignin levels generally tended to increase slightly with increasing temperature. In the temperate grasses, lignin, hemicellulose and cellulose levels all showed a consistent increase with growth temperature. At each growth temperature the lignin content of the species in the tropical group had a significant negative correlation with in vitro digestibility, and lignin appeared to be more closely associated with hemicellulose than with cellulose. In contrast, at each temperature, variation in digestibility between species of the temperate group was not correlated with lignin. Levels of cell wall components in the later-harvested material from Lolium varied in a similar manner to that of the younger growth stage, whereas older Panicum cell wall constituents showed more variability.

An evaluation of Panicum maximum cv. Gatton: 2. The influence of stage of maturity on diet selection, intake and rumen fermentation in sheep

“…The reason for this is not clear, since several authors have shown that NDF, ADF and ADL concentrations increase with stage of maturity (Garcell & Poppe, 1989;Buxton, 1991;Jung & Vogel, 1992;Kephart & Buxton, 1993;Hatfield et al, 1994). Digestibility decreased with level of maturity in all seasons except winter (Table 2) in agreement with reports showing that a decrease in N content and an increase in NDF, ADF and ADL content is associated with a decrease in digestibility (Ford et al, 1979;Cilliers & Van der Merwe, 1993). Digestible organic matter intake (DOMI) decreased from young to mature pastures in summer and autumn (Table 3).…”

Physiological and Genomic Basis of Mechanical-Functional Trade-Off in Plant Vasculature

“…For example, lignin amount in Picea abies is predicted to correlate positively with annual average temperature (Gindl et al, 2000). Temperate monocots as well show an increase of lignin in response to increasing temperature (Ford et al, 1979). In Triticum aestivum, 2 • C chilling stress decreases leaf lignin but increases in root is observed (Olenichenko and Zagoskina, 2005).…”

Características anatômicas e valor nutritivo de quatro gramíneas predominantes em pastagem natural de Viçosa, MG

“…O maior efeito ambiental é provocado pela temperatura sob a qual a planta se desenvolve, pois altas temperaturas de crescimento aceleram o espessamento da parede celular e induzem à lignificação sem causar mudanças marcantes na anatomia foliar (Ford et al, 1979;Akin et al, 1987). Contudo, a maturidade pode provocar, além da lignificação da parede celular, aumento na proporção dos tecidos lignificados (Wilkins, 1972;Jung, 1989;Alves de Brito et al, 1999;Paciullo et al, 2002).…”