Synergistic development of maize stalk as a strategy to reduce lodging risk

Abstract

AbstractThe reason for different maize (Zea mays L.) hybrids exhibiting differences in stalk lodging risk between the 12‐leaf (V12) and flowering stages is unclear. This study tracked internode development included morphology, carbohydrate accumulation, and mechanical strength of basal internodes in four widely‐planted maize hybrids in China for two consecutive growing seasons. And then used logistic model to estimate the time of initiation and termination of rapid thickening, lengthening, accumulation of dry weight per unit length (DWUL), cellulose, lignin, and increase in rind penetration strength (RPS) of internodes. Planting density was 7.5 × 104 plants ha−1. The results shows that basal internodes development in maize begins with a period of rapid thickening and lengthening, followed by DWUL accumulation, and finally an increase in RPS. The period of DWUL accumulation was the longest of these developmental periods and occurred throughout internode development. For hybrid with a low risk of stalk lodging, RPS development began in later part of the rapid elongation period. In contrast, rapid RPS development in hybrid with a high risk of stalk lodging began after the rapid elongation period. Rapid DWUL accumulation and RPS development can reduce the adverse effects caused by rapid elongation of basal internodes. The shorter the interval between rapid elongation, DWUL accumulation, and RPS development of the basal internodes, the greater a plant's resistance to stalk lodging. Therefore, lodging risk can be reduced through selection and breeding strategies that achieve synergistic development of morphology, dry matter accumulation, and mechanical strength in maize stalks.