passages.id: split_5_test_1687_passage
passages.type: progene_text
passages.text: A tobacco cDNA ( NtSLT1 , for Nicotiana tabacum sodium - and lithium - tolerant ) was isolated by functional complementation of the salt - sensitive phenotype of a calcineurin ( CaN ) - deficient yeast mutant ( cnb delta , regulatory subunit null ) .