Acacia Mangium: Growing and Utilization by Kamis Awang, Davis Taylor (eds)

By Kamis Awang, Davis Taylor (eds)

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Mculgirim and A. rrriricriliformis hybridize with each other quite readily. The pcrccntagc of infruclcsccnccs formed as a result of hybridization was almost double (44%) whcn A. ~ hybridized with A. nztrrrgirim, compared to 23% successful hybridization bctwccn A. mrrrrgirirrr and A. crriricrtlifonnis (Zakaria 199 1 ). However, the production o f pods per inhctcscencc was Sound to bc highcr in crosses bctwccn A. nzcrrrgirim x A. ririricril~forn~is than A. rx A. In addition. seed yield was x A. rrriricril~fonnisthan in A.

Using the anther rncthod (without cmasculat ion) Zakaria ( I99 1) found that both A. mculgirim and A. rrriricriliformis hybridize with each other quite readily. The pcrccntagc of infruclcsccnccs formed as a result of hybridization was almost double (44%) whcn A. ~ hybridized with A. nztrrrgirim, compared to 23% successful hybridization bctwccn A. mrrrrgirirrr and A. crriricrtlifonnis (Zakaria 199 1 ). However, the production o f pods per inhctcscencc was Sound to bc highcr in crosses bctwccn A.

Retinodes (Bcrnhardl el al. 1984). In acacias, polyad morphology (Kenrick and Knox 1982) and the prcscncc of post-pollination exudate (Kcnrick and Knox 198 1 ; Marginson ct al. 1985) play important roles in ensuring successful seed set following a single pollination went. A successfully placed polyad fils well inlo the dcprcssion of (he cupshaped stigma. Since the polyad is a biconvcx disc lwo grains thick in Ihc center (Kenrick and Knox 1979). only half of its pollen grains are in conlacl with the stigma.

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