Systemic acquired resistance induced by BTH in papaya
نویسندگان
چکیده
Systemic acquired resistance (SAR) in Carica papaya L. is induced by benzothiadiazole (BTH). The response is manifested by increased tolerance to infection by the virulent pathogen Phytophthora palmivora, by increased b-1,3-glucanase and chitinase activities, and by increased accumulation of a PR1 mRNA. Infection of untreated papaya by P. palmivora also induced b-1,3-glucanase and chitinase activities but at much lower levels. This response to P. palmivora is characteristic of a compatible interaction. Papaya has at least four members of the PR-1 gene family; BTH reduces mRNA accumulation for two of these and increases it in the other two. One of these, PR-1d, is induced over 20-fold; mRNA accumulation for this gene increased for at least 14 days after BTH treatment. In contrast, both chitinase and b-1,3-glucanase activities peaked after 1–2 days then returned to base levels at approximately 10 days. Papaya has an NPR1 gene that contains structural domains conserved with arabidopsis; these domains are involved in protein–protein interactions and nuclear localization, which are essential for function in SAR of arabidopsis. The papaya NPR1 gene is expressed constitutively and is slightly induced by BTH treatment. Overall, these findings indicate the basic elements of papaya SAR resemble the pathway as described in arabidopsis and tobacco. q 2004 Elsevier Ltd. All rights reserved.
منابع مشابه
Benzothiadiazole, a novel class of inducers of systemic acquired resistance, activates gene expression and disease resistance in wheat.
Systemic acquired resistance is an important component of the disease resistance repertoire of plants. In this study, a novel synthetic chemical, benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester (BTH), was shown to induce acquired resistance in wheat. BTH protected wheat systemically against powdery mildew infection by affecting multiple steps in the life cycle of the pathogen. The ons...
متن کاملBenzothiadiazole-induced priming for potentiated responses to pathogen infection, wounding, and infiltration of water into leaves requires the NPR1/NIM1 gene in Arabidopsis.
Systemic acquired resistance (SAR) is a plant defense state that is induced, for example, after previous pathogen infection or by chemicals that mimic natural signaling compounds. SAR is associated with the ability to induce cellular defense responses more rapidly and to a greater degree than in noninduced plants, a process called "priming." Arabidopsis plants were treated with the synthetic SA...
متن کاملInduction of systemic acquired resistance in cotton by BTH has a negligible effect on phytophagous insects
Whether or not chemical changes in plants in response to pests (insects and pathogens) are general or specific remains unclear. Some evidence indicates that an induced response (IR) to arthropods via the octadecanoid pathway represents a distinct mechanism from the salicylic acid-based pathway of systemic acquired resistance (SAR) to pathogens. To further test this hypothesis, young cotton seed...
متن کاملSystemic Induction of the Small Antibacterial Compound in the Leaf Exudate During Benzothiadiazole-elicited Systemic Acquired Resistance in Pepper
Plants protect themselves from diverse potential pathogens by induction of the immune systems such as systemic acquired resistance (SAR). Most bacterial plant pathogens thrive in the intercellular space (apoplast) of plant tissues and cause symptoms. The apoplastic leaf exudate (LE) is believed to contain nutrients to provide food resource for phytopathogenic bacteria to survive and to bring ha...
متن کاملAirborne induction and priming of plant defenses against a bacterial pathogen.
Herbivore-induced plant volatiles affect the systemic response of plants to local damage and hence represent potential plant hormones. These signals can also lead to "plant-plant communication," a defense induction in yet undamaged plants growing close to damaged neighbors. We observed this phenomenon in the context of disease resistance. Lima bean (Phaseolus lunatus) plants in a natural popula...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004