Table IV.

Comparison of “biological genomic” traits in established model plants and B. distachyon

ArabidopsisB. distachyon (ABR1)Rice
 Plant familyCrucifereaePooideaeOryzoideae
 Chromosome no.10 (2n)10 (2n)24 (2n)
 Genome size (1C)164 Mbp4-a 160 Mbp441 Mbp4-a
 Amount of repetitive DNA16%4-b 12%–15%4-c ∼20%4-d
 Breeding strategySelf fertileSelf fertileOutbreeder
 Life cycle (weeks)4-e 8–104-f 11–184-g 20–304-h
 Height at maturity (m)∼0.2∼0.21–1.2
 Planting density for M2 seed collection (plants m−2)∼300∼3008–10
 Seed yield plant−1 >100080–200>1,000
 Seed yield m−2 >300,00024–60,000>8,000
 Growth requirementsSimpleSimpleRelatively specialized4-i
 Transformation efficiency0.5%–4%4-j ∼53–84-k
  • F4-aBennett et al., 2000.

  • F4-bPruitt and Meyerowitz, 1986.

  • F4-cCatalan et al., 1995.

  • F4-dDeshpande and Ranjekar, 1980.

  • F4-e  Life cycle defined as time from seed germination to harvesting of first seed.

  • F4-fSommerville and Meyerowitz, 1994.

  • F4-g  Depending on vernalization requirement.

  • F4-h  Observed at the UW Aberystwyth.

  • F4-i  To achieve fast growth and controllable flowering in temperate latitudes, many rice varieties require to be grown at high light intensity in a heated greenhouse with purpose-built irrigation/flooding systems. Specialized environmentally controlled growth cabinets are often required for the production of somatic embryos suitable for tissue culture.

  • F4-j  Transformation frequency in Arabidopsis is presented as the proportion of transgenic to wild-type seeds recovered from florally “dipped” plants (Cough and Bent, 1998).

  • F4-k  The comparative data concerning rice callus transformation is derived from Li et al. (1993) and Biswas et al. (1998) and is expressed as the number of transgenic plants produced 1 g embryogenic tissue−1 bombarded with microprojectiles.