檬果開花前後樹體光合產物之運移與利用

Translocation and Utilization of Photosynthates in Mangifera indica L. about Bud-bursting Period

利用14C處理三年生盆栽檬果以觀察其光合產物於開花期間之運移、利用情形，發現：（1）萌芽前：光合產物主要向下運送，並經由樹皮平行轉移至木質的部分，少部分會向上轉移至未處理部位。光合產物主要蓄積於葉片、主幹及根部中。（2）萌芽初期：貯存於葉片、莖部的樹皮及根的養分均向上運送以供新生部分長用，主幹（包括接穗主幹及砧木主幹）樹皮中之放射活性則有部分轉移至木質部分。新生部分有極高之放射活性，顯示花序、新梢生長所需之養分大部分來自樹體所蓄積的養分。

Three-year-old potted mango trees were treated with 14C-CO2 in order tostudy the translocation and utilization of photosynthates during the sprouting and blooming period. Before sprouting, there was an apparent downward transport of photosynthates and a partial transverse transport (form bark into wood). A very small amount of upward transport was also detected. Soon after sprouting, there was a decrease of the radioactivity in the bark and anincrease of that in the wood. White in its new formed organs, namely the new shoot and inflorescences possessed a relative high radioactivity.