Ishwarya Lakshmi K S, Dhillon Mukesh K, Mukri Ganapati, Mahendra K R, Gowtham K V, Tanwar Aditya K
Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, India.
Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi, India.
Front Plant Sci. 2024 Dec 9;15:1517848. doi: 10.3389/fpls.2024.1517848. eCollection 2024.
In recent years, the fall armyworm, has rapidly emerged as a global invasive pest, challenging the maize production and leading to considerable economic losses. Developing resistant hybrids is essential for sustainable maize cultivation, which requires a comprehensive understanding of resistance traits and the underlying mechanisms in parental lines. To address this need, the present study aimed to identify the sources of resistance, age and stage-specific effects and role of phytochemicals in plant defense against in thirty diverse maize parental lines [17 female (A) and 13 male (R) lines]. The study revealed that the larvae fed on maize A-lines CML 565, AI 501, AI 544 and PDIM 639, and R-lines AI 125, AI 542, AI 155, AI 1100 and PML 105 exhibited a reduced intrinsic (r) and finite rate of increase (λ), and net (R) and gross reproduction rates (GRR); while, increased mean generation time (T) and doubling time (DT). Among these, A-lines CML 565, PDIM 639 and AI 544, and R-lines AI 125, AI 155 and AI 1100 showed higher detrimental effect on reproductive value of . Aforesaid A- and R-lines were also found with greater increase in insect-induced test phytochemicals compared to other lines, accounting for 25.0 to 72.8% variation in the life table parameters, indicating antibiosis effect on . Among the test phytochemicals, tannins, CAT, PAL, TAL and APX inflicted greater effect, indicating their role in induced-biochemical defense against
近年来，草地贪夜蛾迅速成为一种全球入侵性害虫，对玉米生产构成挑战并导致相当大的经济损失。培育抗性杂交种对于玉米可持续种植至关重要，这需要全面了解亲本系中的抗性性状及潜在机制。为满足这一需求，本研究旨在确定30个不同玉米亲本系（17个母本系“A”和13个父本系“R”）中的抗性来源、年龄和阶段特异性效应以及植物化学物质在植物抵御草地贪夜蛾中的作用。研究表明，取食玉米母本系CML 565、AI 501、AI 544和PDIM 639以及父本系AI 125、AI 542、AI 155、AI 1100和PML 105的幼虫，其内在增长率（r）和有限增长率（λ）、净增殖率（R）和总繁殖率（GRR）降低；而平均世代时间（T）和加倍时间（DT）增加。其中，母本系CML 565、PDIM 639和AI 544以及父本系AI 125、AI 155和AI 1100对草地贪夜蛾的繁殖价值显示出更高的有害影响。与其他品系相比，上述母本系和父本系还发现昆虫诱导的测试植物化学物质增加幅度更大，占生命表参数变异的25.0%至72.8%，表明对草地贪夜蛾有抗生作用。在测试的植物化学物质中，单宁、过氧化氢酶（CAT）、苯丙氨酸解氨酶（PAL）、酪氨酸解氨酶（TAL）和抗坏血酸过氧化物酶（APX）造成的影响更大，表明它们在诱导生化防御草地贪夜蛾中发挥作用
