Abstract
ABSTRACT The essay objective was to correlate lignin content resulting from tigmomorphogenesis induced by stem swaying with survival and post-planting growth of P. taeda seedlings. Seedlings were subjected to daily frequencies (0, 5, 10, 20 and 40 movements) of stem swaying for 60 days. By the end of the treatments, we determined lignin content of below and aboveground seedling tissues. Four replicates per treatment were planted in a area cultivated with pines. Ninety days after planting, survival and increments of seedling height, stem diameter and stem volume were quantified. Application of 20 stem swayings increased lignin in both below and aboveground plant tissues. Outplanted seedling survival was reduced with 40 stem swayings while growth increments were increased with both 10 and 20 stem swayings. Lignin content from belowground plant tissues was positively correlated with outplanted seedling survival while lignin from aboveground tissues correlated with height and stem volume increments. P. taeda seedlings with higher lignin content have higher survival chances after planting.
Highlights
The essay objective was to correlate lignin content resulting from tigmomorphogenesis induced by stem swaying with survival and post-planting growth of P. taeda seedlings
The coefficients of variation resulted in values of 2.8%, 4.3%, 8.2%, 9.0%, 9.7% and 9.9% for the lignin content in root tissue, shoot tissue, percentage of seedling survival and increments of height, stem diameter and volume, respectively
Analysis of variance revealed that frequency of stem swaying applied in P. taeda seedlings significantly altered lignin content in above and belowground tissues (Figure 2)
Summary
The essay objective was to correlate lignin content resulting from tigmomorphogenesis induced by stem swaying with survival and post-planting growth of P. taeda seedlings. Lignin content from belowground plant tissues was positively correlated with outplanted seedling survival while lignin from aboveground tissues correlated with height and stem volume increments. RESUMO – O ensaio objetivou correlacionar o teor de lignina resultante da tigmomorfogênese induzida por flexões caulinares com a sobrevivência e o crescimento pós-plantio em mudas de P. taeda. A campo, a sobrevivência das mudas foi reduzida com o tratamento de 40 flexões, enquanto as taxas de crescimento foram aumentadas com a aplicação de 10 ou 20 flexões. O teor de lignina nos tecidos radiculares correlacionou-se positivamente com a sobrevivência a campo da mudas, enquanto o teor nos tecidos aéreos correlacionou-se com os incrementos em altura e no volume do caule. Response of plant growth to mechanical disturbance was coined as thigmomorphogenesis by Jaffe (1973) which causes reduction of primary growth (TELEWSKI; PRUYN, 1998; COUTAND et al, 2010), changes biomechanical properties of wood (CORDERO, 1999) and stimulates biosynthesis and chemical composition of lignin (KERN et al, 2005; HAMANN et al, 2009; SAIDI et al, 2011; RAMOS et al, 2012)
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