1. the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings
protoxylem 片语
片语
protoxylem m初生木质部
endarch protoxylem内源型先成木质部
protoxylem lacuna[植]
protoxylem pole[植]
protoxylem gap原生木质部隙
protoxylem vessel原生木质部导管
protoxylem strand原生木质部束
protoxylem 例句
英汉例句
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.