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Figure 5.25: Transverse sections of the embryo of Prumnopitys taxifolia showthe arrangement of the developing vascular tissues in relation tothe cotyledons.A - H : A mature embryo within the female gametophyte (fg), in a non-adjacentseries of TS. The gametophyte centreline has been drawn on each image to showthat this particular embryo has diagonal orientation with respect to the broad axis (ba)of the gametophyte. Scale bar (A) = 500 pm. Scale bars (B-H) = 100 pm.A : Whole female gametophyte (fg) with the embryo (e), sectioned at the level ofthe upper hypocotyl (see also E). The dark line around the perimeter is allthatremains of the parietal layers (pl) of the nucellus, reduced to a papery'skin'. Notethat the difference between the broad and narrow axes of the gametophyte has beenexaggerated by sectioning pressure. The gametophyte was also damaged duringremoval of the hard seed coat.B : The crushed suspensor (s) lies in the cavity toward the micropylar end of thegametophyte.C : Dead cells are present at the tip of the root cap (rt).D : ln the lower hypocotyl, the developing vascular tissues are radially symmetrical.Recognisable tissues are: epidermis (ep), isolated tanniniferous cells (tc) under theepidermis, cortex (cx), six secretory canals (arrowheads), and pith (pi) at the centre ofthe procambialtissue.E : Detail of the same section as shown in A. In the upper hypocotyl, the vasculartissue arrangement becomes a rectangle defined by the six secretory canals(arrowheads) and two bands of procambial tissues (pc), with pith at the centre.F : Just below the cotyledons, only the four outer secretory canals (arrowheads) arepresent, with four zones of procambialtissue (pc).G : At the base of the cotyledons (cot), the shoot apex (sa) extends the full width ofthe embryo, with zones of meristematic tissue (arrows) at both ends. Each cotyledonhas two vascular bundles (vb), each accompanied by a secretory canal.H : The cells at the tip of the shoot apex (sa) are quiescent. At this level, the twovascular bundles are more clearly defined in each cotyledon (cot). The adaxialfacesof the cotyledons meet above the shoot apex.
Aa-:EDHFig. 5.25
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E vte*tJ(!rsHl.q"*$tBgHfrrsgJ{.ji .
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o P. taxifoliao P. ferruginea_ 5-.
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FFig.3.1
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Fig. 3.2
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[..#Hll,';',i. IFig. 3.3
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Fig. 3.4
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.'TA,{-t,I-t-_--lr:Tfii: i, 1,..1;1
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Fig. 3.6
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Figure 3.8: Sporangial wall of the
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Figure 3.9: (Prumnopitys taxifolial
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Figure 3.10: Development of the mic
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Figure 3.1 1: (Prumnopitys taxifoli
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Figure 3.12: Germination of the mic
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Figure 3.13: The exine, intine and
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Figure 3.14: Cellular and free-nucl
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Figure 3.15: Germinated pollen grai
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Figure 3.16: Development of the mal
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Figure 3.17: Pollen tube and body c
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Figure 3.18: The body cell nucleus
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Figure 3.19: Targetting of archegon
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Figure 3.20: The male gametes in Pr
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Figure 4.1: Morphology and developm
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Figure 42 : Earl development of tlt
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Figure 4.3 : Initiation of fertile
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Figure 4.4 : The ovular complex at
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Figure 4.5: (Prumnopitys taxifolial
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Figure 4.6:The nucellus cone before
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Figure 4.7: Post-pollination develo
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Figure 4.8: Transverse sections of
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Figure 4.9: Tissues of the one year
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Figure 4.10: (Prumnopitys taxifolia
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Figure 4.12: Development of the meg
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Figure 4.13: Megaspore tetrads in P
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Figure 4.14: Development of the fem
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Figure 4.16: Occasionally two or ev
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Figure 4.17: ln Prumnopitys taxifol
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Figure 4.18: Features of the centra
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Figure 4.19: Characteristics of the
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Figure 4.20: The archegonium reache
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Figure 4.21: The developing central
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Figure 4.24: Stages in the maturati
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Figure 4.25: Volumes of thirty-thre
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Figure 4.28: Up to four archegonia
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Figure 4.29: The cell wall of the m
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Figure 4.30: Some characteristics o
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Figure 4.31: Another example of an
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Figure 4.33: Electron micrographs o
Page 112 and 113: Figure 4.34: Electron-micrographs o
Page 114 and 115: Figure 5.1: lntact and penetrated n
Page 116 and 117: Figure 5.2 Material from the pollen
Page 118 and 119: Figure 5.3: ln Prumnopitys taxifoli
Page 122 and 123: Figure 5.5 After fertilization, the
Page 124 and 125: Figure 5.6: Unfertilized archegonia
Page 126 and 127: Figure 5.7: Changes in unfertilized
Page 128 and 129: Figure 5.8: An unusual archegonium
Page 132 and 133: Figure 5.10: ln Prumnopitys taxifol
Page 138 and 139: Figure 5.13: Outside the newly cell
Page 142 and 143: Figure 5.15: ln Prumnopitys taxitol
Page 144 and 145: Figure 5.16: Five-celled and eight-
Page 146 and 147: Figure 5.17: Some proembryos can ha
Page 148 and 149: Figure 5.18 : ln Prumnopitys taxifo
Page 150 and 151: Figure 5.19: ln Prumnopitys taxitol
Page 152 and 153: Figure 5.20: The middle of the susp
Page 154 and 155: Figure 5.21 : ln Prumnopitys taxifo
Page 160 and 161: Figure 5.24: Within the female game
Page 164 and 165: Figure 5.26: One embryo was observe
Page 166 and 167: Figure 5.27: The dehiscence zone in
Page 168 and 169: Figure 5.28: Transition between hyp
Page 170 and 171: Figure 5.29: In the germinating emb
Page 172 and 173: Figure 5.30 : Further tissue develo
Page 174 and 175: Figure 5.31: In the germinating emb
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