Where did the sub 1 gene come from?

Where did the sub 1 gene come from?

The submergence tolerance gene SUB1 was identified from an Indian land race from Orissa, FR13A. It was fine mapped and transferred into several mega rice varieties; five of them are from Indian subcontinent, using marker assisted backcross (MABC) breeding to conventional plant breeding.

What does SUB1 do?

A major quantitative trait locus (QTL) called SUBMERGENCE-1 (SUB1) is responsible for conferring submergence tolerance to the rice landrace Flood Resistant 13A (FR13A).

What was the purpose of the sub 1 gene How did adding the sub 1 gene into rice help farmers in poor countries?

Sub1A gene encoding ERF transcription factor confers tolerance to flooding in rice8. It reduces ethylene sensitivity of rice plants under submergence and thereby checks rapid stem elongation and chlorophyll degradation9,10.

What is rice submergence?

Submergence tolerance is defined as the ability of a rice plant to survive and continue growing after being completely submerged in water for several days. Rice plants are less tolerant of submergence at the early growth stages (Adkin et al., 1990).

What is Rice submergence?

Which of the following rice variety that can tolerate submergence?

All these studies have used the landrace FR13A, which is one of the most submergence-tolerant donor varieties. The major QTL, named Sub1, with a LOD score of 36 and an R2 value of 69 % (Xu and Mackill, 1996), provides tolerance to complete submergence for up to 2 weeks.

What does the term submergence mean?

Definitions of submergence. sinking until covered completely with water. synonyms: immersion, submerging, submersion. types: dip. a brief immersion.

Which rice variety is more tolerant for deep water rice?

Other lines identified as tolerant to flash flooding: FR43B, Thalavu and BKNFR76106-16-0-1-0. More recently we have found that IR49830-7-1-2-1-3 is an excellent donor with high yielding ability. Many traditional varieties for deep water rice and floating rice have been used as donor from various countries.

What is the opposite of submerge?

submerge. Antonyms: raise, extricate, educe. Synonyms: drown, plunge, overwhelm, deluge, inundate, fink, steep, immerse.

What does Subdived mean?

1 : to divide the parts of into more parts. 2 : to divide into several parts especially : to divide (a tract of land) into building lots. intransitive verb. : to separate or become separated into subdivisions. Other Words from subdivide Example Sentences Learn More About subdivide.

Does rice grow underwater?

Rice is a crop that can flourish in flooded soils, whereas many other plants will die, so flooding of rice paddies is an important way to control weeds in rice fields. However, even rice plants can suffer yield loss or die if the water is too deep for a long time.

Can rice drown?

“Even a crop like rice, which grows in standing water, cannot stand to be totally submerged. It’ll drown like any other plant,” Zeigler says. That usually takes just three or four days. “It looks pretty much like a normal crop.

What is Sub1A and sub1b?

Two of these genes, Sub1B and Sub1C, are invariably present in the Sub1 region of all rice accessions analysed. In contrast, the presence of Sub1A is variable. A survey identified two alleles within those indica varieties that possess this gene: a tolerance-specific allele named Sub1A-1 and an intolerance-specific allele named Sub1A-2.

How does sub1a-1 gene affect tolerance to submergence?

It was in fact demonstrated that SUB1A confers tolerance to submergence by limiting ethylene-promoted GA responsiveness by enhancing the accumulation of the GA signalling repressors, SLR1 and SLRL1 (Fukao & Bailey-Serres, 2008 ). Rice varieties possessing the SUB1A-1 gene are tolerant to submergence because they stop growing when submerged.

Why is the sub1a1 gene absent in rice?

In submergence-intolerant and moderately tolerant rice genotypes, the SUB1A-1 gene is either absent, due to an inversion-deletion, or present as an allelic variant, SUB1A-2 (Singh et al., 2010) (Additional file 1: Figure S1a).

What is the size of the Sub1 region?

The Sub1 region, bordered by the markers CR25K and SSR1A, physically spans over 182 kilobases (kb).