Artificial hybrids in Cryptocoryne (Araceae) 5: Hybridization with species from Sumatera, Indonesia

 

Niels Jacobsen, Jan D. Bastmeijer, Alfred Waser, Suwidji Wongso & Marian Orgaard

 

ABSTRACT

We attempted to hybridize species of Cryptocoryne from Sumatera mainly within the chromosome groups of 2n = 34, 68 & 102, and we also attempted crosses between Sumateran species and those from the Malay Peninsula and Borneo with equal chromosome numbers. The success of obtained hybrids was somewhat lower (6%) than that found in the previous studies (Malay Peninsula 8%; Borneo 9%, Peninsular Malaysia – Borneo 11%), probably due to inadequate cultivation conditions. We succeeded in resynthesizing C. ×zukalii nothovar. sumateraensis, one of the naturally occurring hybrids of Sumatera. Combinations including the tetraploid C. bangkaensis (2n = 68) contributed 69% of the successfully raised hybrids. Our results suggest that it may be possible to find and identify more naturally occurring hybrids than those presently known from Sumatera.

 

KEYWORDS

Araceae, chromosome numbers, Cryptocoryne, natural & artificial hybridization, Sumatera, Indonesia