为什么说花是变态的短枝？有何证据？
为 什 么 说 花 是 变 态 的 短 枝 ？ 有 何 证 据 ？
The ABC ModelThree classes of geneproductsCombinatorial interactionsto give rise to the four typesof floral organsSepalsPetalsStamensCarpels- A-function = sepalsAA+BB+CCidentityACA+B-function =petalsBPIAP3identityB+C-function= stamensidentitySCFUFOC-function = carpelsidentityNatureReviews|Genetics
• Three classes of gene products • Combinatorial interactions to give rise to the four types of floral organs – A-function = sepals identity – A+B-function = petals identity – B+C-function = stamens identity – C-function = carpels identity The ABC Model
FAWT（A正常花),C类基因突变ag-3（F)matureflowers，缺少雄蕊和雌蕊
WT (A正常花), C 类基因突变 ag-3 (F) mature flowers， 缺少雄蕊和雌蕊
Loss of A Functionap2 1mutantBBBBStStStSA类基因突变,缺少花萼花冠
Loss of A Function - ap2 mutant A A B B C C Sp P St C C St P Sp B B C C C St St C C St St C A 类 基 因 突 变，缺 少 花 萼 花 冠
Loss of B gene function -apetala3/pistillatamutantspiBBAA信SpB类基因突AA变，缺少Sp花冠和雄蕊ap3
Loss of B gene function - apetala3 /pistillata mutants ap3 pi A A B B C C Sp P St C C St P Sp A A C C Sp C C Sp Sp C C Sp B 类 基 因 突 变，缺 少 花 冠 和 雄 蕊