AEROBIC VERSUS ANAEROBIC GERMINATION PERFORMANCE OF SELECTED RICE (Oryza sativa L.) GENOTYPES WITH OR WITHOUT SUBMERGENCE TOLERANCE

Abstract

Ten selected rice genotypes adapted to rainfed lowland ecosystem of Assam was evaluated for their ability to germinate and grow underwater (anoxic condition) in comparison to the aerobic condition. Anaerobic germination was allowed 10 cm water depth in pots partially filled with soils inside the net house, while Petri dishes lined with filter papers were used for aerobic germination. A general trend in reduction of germination and seedling traits were observed for all the genotypes. Three of the tolerant genotypes namely Badal, Swarna Sub 1 and Solpuna showed germination enhancement under anaerobic condition, the highest significant increase (24.3%) being registered for Badal, a cultivar adapted to semi-deep water (42-75 cm) situation indigenous to Assam followed by Swarna Sub 1 (11.6%) and Solpuna (2.1%). Both Badal and Swarna Sub 1 are tolerant to submergence at vegetative stage. Solpuna, another local cultivar adapted to the lowland ecosystem with no known submergence tolerance recorded the highest shoot length under the anoxic condition which was significantly superior to its aerobic performance. The reduction in root length was the minimum for Solpuna followed by Swarna Sub 1 and Manohar Sali. The landrace Solpuna exhibited statistically at par performance with respect to seedling length and seedling vigour index under both the environments. Seedling vigour index proved to be a reliable character for desirable improvement in rice anaerobic germination and growth. Cluster analysis grouped Solpuna separately which might be due to its unique performance under anaerobic condition. Solpuna proved its superiority over the other nine genotypes in its ability to germinate and grow under anoxic condition. The present study further indicated that AG tolerance might be independent of the submergence tolerance at the vegetative stage conferred by SUB 1A gene or gene (s) with similar effects.

Synthesis and properties of CA/ZnONPs electrospun nanofiber as seed coating to enhance germination of aerobic rice seed

“…Aerobic paddy rice can be cultivated in a variable geographical area compared to anaerobic paddy, which needs flat land [16]. However, aerobic paddy seeds often compete with weeds and various soil profiles, significantly impacting seed germination and development [17]. Herein, ZnONPs nanoparticles serve as essential micronutrients in assisting and inducing the seed germination phase allowing vigor of the germinated seedlings to compete with the presence of biotic and abiotic stress [18].…”

Penampilan Agronomi Galur-Galur Padi Sawah Tadah Hujan Toleran Kondisi Anaerob pada Fase Perkecambahan

“…Kata kunci: cekaman abiotik, perkecambahan anaerob, tebar benih langsung PENDAHULUAN Anomali iklim yang saat ini terjadi berdampak terhadap sulitnya memperkirakan intensitas banjir yang melanda pertanaman padi, baik durasi terendamnya tanaman maupun ketinggian permukaan airnya (Nugraha et al, 2013;Yullianida et al, 2014). Secara umum benih tanaman padi akan gagal tumbuh pada kondisi kurang oksigen atau terendam selama beberapa hari, namun beberapa varietas padi dapat menunjukkan toleransi terhadap kondisi anaerob selama perkecambahan (anaerobic germination), dengan cara munculnya koleoptil dan pertumbuhan parsial (Bordoloi et al, 2018). Cekaman kondisi anaerob pada sistem tebar benih langsung (tabela) disebabkan oleh lahan kurang rata atau sistem drainase yang buruk.…”