Natural Variation in Arabidopsis Cvi-0 Accession Reveals an Important Role of MPK12 in Guard Cell CO2 Signaling

Plant gas exchange is regulated by guard cells that form stomatal pores. Stomatal adjustments are crucial for plant survival; they regulate uptake of CO2 for photosynthesis, loss of water, and entrance of air pollutants such as ozone. We mapped ozone hypersensitivity, more open stomata, and stomatal CO2-insensitivity phenotypes of the Arabidopsis thaliana accession Cvi-0 to a single amino acid substitution in MITOGEN-ACTIVATED PROTEIN (MAP) KINASE 12 (MPK12). In parallel, we showed that stomatal CO2-insensitivity phenotypes of a mutant cis (CO2-insensitive) were caused by a deletion of MPK12. Lack of MPK12 impaired bicarbonate-induced activation of S-type anion channels. We demonstrated that MPK12 interacted with the protein kinase HIGH LEAF TEMPERATURE 1 (HT1)-a central node in guard cell CO2 signaling-and that MPK12 functions as an inhibitor of HT1. These data provide a new function for plant MPKs as protein kinase inhibitors and suggest a mechanism through which guard cell CO2 signaling controls plant water management.</p

Ribonuclease activity of buckwheat plant (Fagopyrum esculentum) cultivars with different sensitivities to buckwheat burn virus

Ribonucleases (RNases) are present in base-level amounts in intact plants, but this level is able to increase greatly under stress conditions. The possible cause for such an increase is protection against plant RNA-virus attack. Buckwheat burn virus (BBV) is a highly virulent pathogen that belongs to Rhabdoviridae family. In our study, we have analyzed the correlation between RNase activity and resistance of different buckwheat cultivars to BBV infection. Two cultivars, Kara-Dag and Roksolana, with different sensitivities to BBV have been used. Kara-Dag is a cultivar with medium sensitivity to virus and Roksolana is a tolerant cultivar. It has been shown that the base level of RNase activity in Roksolana cultivar was in most cases higher than the corresponding parameter in Kara-Dag cultivar. Both infected and uninfected plants of Roksolana cultivar demonstrated high RNase activity during two weeks. Whereas infected plants of Kara-Dag cultivar demonstrated unstable levels of RNase activity. Significant decline in RNase activity was detected on the 7th day post infection with subsequent gradual increase in RNase activity. Decline of the RNase activity during the first week could promote the virus replication and therefore more successful infection of upper leaves of plants. Unstable levels of RNase activity in infected buckwheat plants may be explained by insufficiency of virus-resistant mechanisms that determines the medium sensitivity of the cultivar to BBV. Thus, plants of buckwheat cultivar having less sensitivity to virus, displayed in general higher RNase activity

Multiplex PCR assay for detection of human interferon alpha2b gene in transgenic plants

During the last decade interferons are regarded as potent candidates for generation of plant-based edible vaccines because of broad spectrum of antiviral activities and adjuvant properties. Establishment and certification of numerous interferon producing plant systems requests development of fast and efficient multiplex PCR protocol for the transgene detection in GM plants. Here we represent a protocol for simultaneous amplification in one assay of fragments of hIFN alpha 2b gene and two control genes, namely virD1 of Agrobacterium tumefaciens and conservative region of plant actin gene.В последнее десятилетие интерфероны рассматриваются как перспективные кандидаты для получения из растений в виде съедобных вакцин, поскольку обладают широким спектром антивирусной активности и адъювантными свойствами. Создание и сертификация многочисленных растительных систем, продуцирующих рекомбинантный интерферон, делают актуальной разработку быстрого и эффективного протокола мультиплексной ПЦР для определения данного трансгена в генетически модифицированных растениях. В настоящей публикации мы приводим метод детекции гена человеческого интерферона альфа-2b в трансгенных растениях с помощью совместной амплификации в ходе одной реакции фрагментов гена hINTα2b и двух контрольных генов, virD1 Agrobacterium tumefaciens и консервативного участка гена актина растений.В останнє десятиліття інтерферони розглядаються як перспективні кандидати для отримання з рослин у вигляді їстівних вакцин оскільки, вони мають широкий спектр антивірусної активності й ад’ювантні властивості. Створення і сертифікація численних рослинних систем, які накопичують рекомбінантний інтерферон, роблять актуальною розробку швидкого й ефективного протоколу мультиплексної ПЛР для визначення даного трансгена в генетично модифікованих рослинах. В цій публікації ми наводимо метод детекції гена людського інтерферону альфа-2b у трансгенних рослинах за допомогою сумісної ампліфікації в ході однієї реакції фрагментів гена hINTα2b і двох контрольних генів, virD1 Agrobacterium tumefaciens і консервативної ділянки гена актину рослин