UNASSIGNED: @entity958 @entity46864 , a senescence-specific gene encoding a @entity462 protease, is widely used as a molecular marker for the study of leaf senescence. To date, its potential orthologues have been isolated from several plant species such as @entity4335 and @entity286 . However, little information is available in rubber tree ( @entity15543 ), a rubber-producing plant of the Euphorbiaceae family. This study presents the identification of @entity46864 -like genes from the rubber tree genome. Results showed that an unexpected high number of 17 rubber orthologues with a single intron were found, contrasting the single copy with two introns in Arabidopsis. The gene expansion was also observed in another two Euphorbiaceae plants, @entity9377 ( @entity9377 ) and physic nut ( @entity21521 ), both of which contain 8 orthologues. In accordance with no occurrence of recent whole-genome duplication (WGD) events, most duplicates in castor and physic nut were resulted from tandem duplications. In contrast, the duplicated HbSAG12H genes were derived from tandem duplications as well as the recent WGD. Expression analysis showed that most HbSAG12H genes were lowly expressed in examined tissues except for root and male flower. Furthermore, HbSAG12H1 exhibits a strictly senescence-associated expression pattern in rubber tree leaves, and thus can be used as a marker gene for the study of senescence mechanism in Hevea.

Survey of the rubber tree genome reveals a high number of XXXX protease-encoding genes homologous to Arabidopsis @entity46864 .

@entity286 :: ('4097', 'Species') :: ['Nicotiana tabacum'] @entity462 :: ('MESH:D003545', 'Chemical') :: ['cysteine'] @entity4335 :: ('3708', 'Species') :: ['Brassica napus'] @entity46864 :: ('834629(Tax:3702)', 'Gene') :: ['SAG12'] @entity958 :: ('3702', 'Species') :: ['Arabidopsis thaliana'] @entity9377 :: ('3988', 'Species') :: ['castor bean', 'Ricinus communis'] @entity21521 :: ('180498', 'Species') :: ['Jatropha curcas'] @entity15543 :: ('3981', 'Species') :: ['Hevea brasiliensis']
@entity462 :: (MESH:D003545,Chemical) :: ['cysteine']
