New Plant Type

Yield gains of 25% is envisaged by improving plant type on another front. Promising new lines with big panicles and a few thick stems are being developed at IRRI.6 So far the performance of the new types are not yet widely available. This approach reminds us of the project for 'super high-yielding rice' in the 1980s in Japan. A series of high-yielding lines were actually produced through this project.

Table 5.1. Loci for hybrid sterility

Locus

Chromosome

Marker genes in order

Crosses

S-5

6

C S-5, Amp-3; Est-2, Pgi-2, RG213, alk

indica x japonica

S-7

7

Rc, S-7, Est-9, rfs, ga-11, Acp-4

Aus x javanica

S-8

6

Cat-1, Pox-5, S-8

IR2061-481 x javanica

S-9

4

Ph, 1g, Mal-1, Est-1, S-9

Aus x javanica

S-15

12

Acp-1. Pox-2, S-15, Sdh-1

IR2061-628 x Dular (Aus)

S-16

1

Est-5

China Native Rice x javanica

S-17(t)

12

Pox-2, S-15, Sdh-1, S-17(t)

P.B. II x japonica

Revised from Wan and Ikehashi 1996.16

Revised from Wan and Ikehashi 1996.16

In any breeding program, if the yield level is emphasized by ignoring other traits, there will be potential for a higher level of yield.

Organic Gardeners Composting

Organic Gardeners Composting

Have you always wanted to grow your own vegetables but didn't know what to do? Here are the best tips on how to become a true and envied organic gardner.

Get My Free Ebook


Post a comment