Functional analysis of root-preferential oil palm metallothionein promoter in tobacco by Masura, Subhi Siti, Shaharuddin, Noor Azmi, Masani, Mat Yunus Abdul, Chan, Kuang-Lim, Low, Eng-Ti Leslie, Chan, Pek-Lan, Rahmah, Abdul Rahman Siti, Amiruddin, Nadzirah, Abdullah, Mohd Puad, Azzeme, Azzreena Mohamad, Parveez, Ghulam Kadir Ahmad, Abd Rasid, Omar